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7.1 MO call
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7.1.1 Functional requirements of serving MSC
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7.1.1.1 Process OCH_MSC
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Sheet 1: the variable TCH allocated is global data, accessible to the procedure Establish_Originating_TCH_If_Required.
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7.1.1.2 Procedure Process_Access_Request_MSC
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Sheet 1, sheet 2: instead of using the explicit procedure Obtain_IMEI_MSC, the MSC may encapsulate the request for the IMEI in the Start ciphering request; the BSS relays the response in the Cipher Mode complete message to the MSC. Sheet 2: the MSC maps the negative response received on the B interface to the appropriate reject cause according to the rules defined in ETS 300 607 [19]. Sheet 2: The Start ciphering request may indicate one of several ciphering algorithms, or no ciphering. Sheet 2, sheet 3: At any stage, the MS may terminate the transaction with the network by sending a CM service abort message. ETSI TS 101 043 V5.6.0 (1998-11) 21 GSM 03.18 version 5.6.0 Release 1996 Sheet 2, sheet 3: if the MSC receives a Setup message from the MS while the access request is being handled, the message is saved for processing after the access request has been handled.
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7.1.1.3 Procedure OG_Call_Setup_MSC
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Sheet 1: the variables Alerting sent and MS connected are global data, accessible to the procedures Send_Alerting_If_Required and Send_Access_Connect_If_Required. Sheet 1: the MSC converts the GSM bearer capability negotiated between the MSC and the MS to a GSM basic service according to the rules defined in ETS 300 582 [15]. Sheet 2, sheet 4: at any stage after the Setup has been received, the MS may terminate the transaction with the network by sending a Release transaction request. Sheet 2: the procedure Set_CLI_Presentation_Indicator_MSC is specific to CLIR. If the VMSC does not support CLIR, processing continues from the "Yes" exit of the test "Result=Call allowed?". Sheet 2: the procedure CAMEL_OCH_MSC_INIT is specific to CAMEL; it is specified in TS 101 044 [5]. If the VMSC does not support CAMEL, processing continues from the "Yes" exit of the test "Result=Pass?". Sheet 3: the procedure CAMEL_OCH_MSC_ANSWER is specific to CAMEL; it is specified in TS 101 044 [5]. If the VMSC does not support CAMEL, processing continues from the "Yes" exit of the test "Result=Pass?". Sheet 3: the procedure Set_COLP_Info_MSC is specific to COLP. Sheet 3: the procedure Handle_AoC_MO_MSC is specific to AoC. Sheet 4: the procedures CAMEL_OCH_MSC_DISC1 and CAMEL_OCH_MSC_DISC2 are specific to CAMEL; they are specified in TS 101 044 [5]. If the VMSC does not support CAMEL, processing continues from the "No" exit of the test "Result=CAMEL handling?". Sheet 4: the procedure CAMEL_OCH_MSC_DISC3 is specific to CAMEL; it is specified in TS 101 044 [5]. Sheet 4: in both subtrees, the processing in the branch beginning with the Int_Release_Call input will occur only if the MSC supports CAMEL.
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7.1.1.4 Procedure Obtain_IMSI_MSC
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The MS may terminate the transaction with the network while the MSC is waiting for the MS to return its IMSI. If a CC connection has not been established, the MS uses CM Service Abort; otherwise it uses a Release, Release Complete or Disconnect. The MSC aborts the transaction with the VLR and returns an aborted result to the parent process.
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7.1.1.5 Procedure Authenticate_MSC
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The MS may terminate the transaction with the network while the MSC is waiting for the MS to respond to an authentication request. If a CC connection has not been established, the MS uses CM Service Abort; otherwise it uses a Release, Release Complete or Disconnect. The MSC aborts the transaction with the VLR and returns an aborted result to the parent process.
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7.1.1.6 Procedure Obtain_IMEI_MSC
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The MS may terminate the transaction with the network while the MSC is waiting for the MS to return its IMEI. If a CC connection has not been established, the MS uses CM Service Abort; otherwise it uses a Release, Release Complete or Disconnect. The MSC aborts the transaction with the VLR and returns an aborted result to the parent process.
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7.1.1.7 Procedure Check_IMEI_MSC
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The MS may terminate the transaction with the network while the MSC is waiting for the MS to return its IMEI. If a CC connection has not been established, the MS uses CM Service Abort; otherwise it uses a Release, Release Complete or Disconnect. The MSC aborts the transaction with the VLR and returns an aborted result to the parent process. ETSI TS 101 043 V5.6.0 (1998-11) 22 GSM 03.18 version 5.6.0 Release 1996 The MS may terminate the transaction with the network while the MSC is waiting for the result of the IMEI check from the EIR. If a CC connection has not been established, the MS uses CM Service Abort; otherwise it uses a Release, Release Complete or Disconnect. The MSC aborts the transaction with the VLR and returns an aborted result to the parent process.
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7.1.1.8 Procedure Establish_Originating_TCH_If_Required
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7.1.1.9 Procedure Set_CLI_Presentation_Indicator_MSC
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The MS may terminate the transaction with the network by sending a Release transaction message while a response is awaited from the process CLIR_MAF004. The message is saved for processing after return from the procedure.
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7.1.1.10 Procedure Send_Alerting_If_Required
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The test "Backward call indicator=no indication" refers to the called party’s status field in the backward call indicators parameter of the ISUP Address Complete message which triggered the call of the procedure Send_Alerting_If_Required. If no useful information would be carried in the Progress message, it is not sent.
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7.1.1.11 Procedure Set_COLP_Info_MSC
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The MS may terminate the transaction with the network by sending a Release transaction message while a response is awaited from the process COLP_MAF006. The message is saved for processing after return from the procedure.
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7.1.1.12 Procedure Send_Access_Connect_If_Required
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The test "Acknowledgement required" refers to the result returned by the procedure Handle_AoC_MSC. If the MSC does not support AoC, processing continues from the "No" exit of the test "Acknowledgement required". If no useful information would be carried in the Facility message, it is not sent.
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7.1.1.13 Procedure Handle_AoC_MO_MSC
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The charging parameters and the Boolean variable Acknowledgement required are global data which can be read by the parent process. ETSI TS 101 043 V5.6.0 (1998-11) 23 GSM 03.18 version 5.6.0 Release 1996 Process in the MSC to handle an outgoing call request Process OCH_MSC OCH_MSC1(1) Signals from the left are from the BSS Idle CM service request Process_ Access_ Request_MSC Result= Pass? Wait_For_ Setup Setup TCH allocated:= False OG_Call_ Setup_MSC Idle CM Service Abort Release call resources Idle Yes No Figure 6: Process OCH_MSC ETSI TS 101 043 V5.6.0 (1998-11) 24 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to handle a request from the MS for system access Procedure Process_Access_Request_MSC PAR_MSC1(3) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR. Process Access Request Wait_For_ PAR_Result Provide IMSI Obtain_IMSI_ MSC Result= Pass? Result:= Fail Wait_For_ PAR_Result Authenticate Authenticate_ MSC Result= Pass? Result:= Fail Wait_For_ PAR_Result Trace Subscriber Activity Tracing Active:= TRUE Wait_For_ PAR_Result Wait_For_ PAR_Result CM service abort Abort Result:= Fail Set Ciphering Mode Ciphering Required:= TRUE Wait_For_ PAR_Result No Yes No Yes Figure 7a: Procedure Process_Access_Request_MSC (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 25 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to handle a request from the MS for system access Procedure Process_Access_Request_MSC PAR_MSC2(3) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR. Wait_For_ PAR_Result Abort CM Service type= Page Response? Map negative response to reject cause CM Service Reject Result:= Fail Release transaction Process Access Request negative response Process Access Request ack Ciphering required? CM Service type= Page Response? Wait_For_ TMSI_ Reallocation CM service abort Abort Result:= Fail Provide IMEI Obtain_IMEI_ MSC Result= Pass? Result:= Fail Wait_For_ TMSI_ Reallocation Setup Check IMEI Check_IMEI_ MSC Result= Pass? Wait_For_ TMSI_ Reallocation Abort Map negative response to reject cause CM Service Reject Result:= Fail Forward New TMSI Reallocate TMSI Wait_For_ TMSI_Ack Use Existing TMSI Result:= Pass CM Service Accept Start ciphering No No No Yes No Yes No Yes Yes Figure 7b: Procedure Process_Access_Request_MSC (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 26 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to handle a request from the MS for system access Procedure Process_Access_Request_MSC PAR_MSC3(3) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR. Wait_For_ TMSI_Ack CM service abort Abort Result:= Fail Setup Abort Result:= Fail TMSI Reallocation Failure Forward New TMSI negative response Result:= Pass TMSI Reallocation Complete Forward New TMSI ack Figure 7c: Procedure Process_Access_Request_MSC (sheet 3) ETSI TS 101 043 V5.6.0 (1998-11) 27 GSM 03.18 version 5.6.0 Release 1996 Procedure in the originating VMSC to set up an outgoing call after a Setup message has been received from the MS Procedure OG_Call_Setup_MSC OCS_MSC1(4) Alerting sent:=False MS connected:=False Convert GSM BC to basic service Send Info For Outgoing Call Wait_For_ MO_Call_ Result Release transaction Abort Release Call Resources Complete Call Convert GSM BC to channel requirement Call Proceeding Establish_ Originating_ TCH_If_ Required Result= Pass? Release Call Resources 1 Send Info For Outgoing Call negative response Release transaction Release Call Resources No Yes Figure 8a: Procedure Outgoing_Call_Setup_MSC (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 28 GSM 03.18 version 5.6.0 Release 1996 Procedure in the originating VMSC to set up an outgoing call after a Setup message has been received from the MS Procedure OG_Call_Setup_MSC OCS_MSC2(4) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the destination exchange. 1 Set_CLI_ Presentation_ Indicator_ MSC Result= Call allowed? Release transaction Release Call Resources CAMEL_OCH_ MSC_INIT See GSM 03.78 Result= Pass? Release Call Resources Initial Address Wait_For_ ACM Address Complete Send_ Alerting_If_ Required Wait_For_ Answer Answer 2 Connect No Yes No Yes Figure 8b: Procedure Outgoing_Call_Setup _MSC (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 29 GSM 03.18 version 5.6.0 Release 1996 Procedure in the originating VMSC to set up an outgoing call after a Setup message has been received from the MS Procedure OG_Call_Setup_MSC OCS_MSC3(4) Signals from the left are from the BSS 2 CAMEL_OCH_ MSC_ANSWER See GSM 03.78 Result= Pass? Set_COLP_ Info_MSC Handle_AoC_ MO_MSC Send_Access_ Connect_If_ Required Result= Fail? Result= Connect sent? Wait_For_ Connect_Ack Connect Ack MS connected:= True Wait_For_ Clear Release call resources Yes No Yes No Yes No Figure 8c: Procedure Outgoing_Call_Setup _MSC (sheet 3) ETSI TS 101 043 V5.6.0 (1998-11) 30 GSM 03.18 version 5.6.0 Release 1996 Procedure in the originating VMSC to set up an outgoing call after a Setup message has been received from the MS Procedure OG_Call_Setup_MSC OCS_MSC4(4) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the destination exchange unless otherwise marked. Wait_For_Connect_Ack, Wait_For_ACM, Wait_For_Answer Release transaction CAMEL_OCH_ MSC_DISC3 See GSM 03.78 Release Release call resources Release From destination exchange CAMEL_OCH_ MSC_DISC3 See GSM 03.78 Release transaction Int_Release_ Call From gsmSSF Release transaction Release Wait_For_ Clear Release transaction CAMEL_OCH_ MSC_DISC1 See GSM 03.78 Result= CAMEL handling? Release Release call resources Release From destination exchange CAMEL_OCH_ MSC_DISC2 See GSM 03.78 Result= CAMEL handling? Release transaction Int_Release_ Call From gsmSSF Release transaction Release No Yes No Yes Figure 8d: Procedure Outgoing_Call_Setup _MSC (sheet 4) ETSI TS 101 043 V5.6.0 (1998-11) 31 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to obtain the IMSI from the MS and relay it to the VLR Procedure Obtain_IMSI_MSC OIMSI_M1(1) Signals to/from the left are to/from the BSS; Signals to/from the right are to/from the VLR Send IMSI Wait_For_ IMSI Send IMSI ack Provide IMSI ack Result:= Pass Release transaction Abort Result:= Aborted Send IMSI negative response Release transaction Figure 9: Procedure Obtain_IMSI_MSC ETSI TS 101 043 V5.6.0 (1998-11) 32 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to obtain an authentication response from the MS and relay it to the VLR Procedure Authenticate_MSC AUT_MSC1(1) Signals to/from the left are to/from the BSS; Signals to/from the right are to/from the VLR Authenticate Wait_For_ Auth_Response Authenticate ack Authenticate ack Wait_For_ Auth_Result Authentication accepted Result:= Pass Authentication rejected Authentication rejected Release transaction Abort Result:= Aborted Authenticate negative response Release transaction Figure 10: Procedure Authenticate_MSC ETSI TS 101 043 V5.6.0 (1998-11) 33 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to obtain the IMEI from the MS and relay it to the VLR Procedure Obtain_IMEI_MSC OIMEI_M1(1) Signals to/from the left are to/from the BSS; Signals to/from the right are to/from the VLR Send IMEI Wait_For_ IMEI Send IMEI ack Provide IMEI ack Result:= Pass Release transaction Abort Result:= Aborted Send IMEI negative response Release transaction Figure 11: Procedure Obtain_IMEI_MSC ETSI TS 101 043 V5.6.0 (1998-11) 34 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to check the IMEI and relay the result to the VLR Procedure Check_IMEI_MSC CIMEI_M1(1) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise. IMEI available? Send IMEI Wait_For_ IMEI CM service abort Abort Result:= Aborted Send IMEI negative response Release transaction Send IMEI ack Check IMEI To EIR Wait_for_ Check_IMEI_ Result Release transaction Abort Result:= Aborted Check IMEI negative response From EIR Check IMEI negative response Result:= Pass Check IMEI ack From EIR Check IMEI ack No Yes Figure 12: Procedure Check_IMEI_MSC ETSI TS 101 043 V5.6.0 (1998-11) 35 GSM 03.18 version 5.6.0 Release 1996 Procedure in the originating VMSC to establish a Traffic Channel if one has not been established for this call Procedure Establish_Originating_TCH_If_Required EOTCIR1(1) Signals to/from the left are to/from the BSS TCH allocated Allocate channel Wait_For_ Allocation_ Complete Release transaction Result:= Fail Allocation failure Release transaction Allocation complete TCH allocated:= True Result:= Pass Result:= Pass False True Figure 13: Procedure Establish_Originating_TCH_If_Required ETSI TS 101 043 V5.6.0 (1998-11) 36 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to determine the CLI presentation indicator value Procedure Set_CLI_Presentation_Indicator_MSC CAIND_M1(1) Signals to/from the right are to/from the process CLIR_MAF004 Initiate handling of CLIR Wait_For_ CLIR_Info Release transaction From BSS Clear call Result:= Call not allowed Continue call handling Result:= Call allowed Figure 14: Procedure Set_CLI_Presentation_Indicator_MSC ETSI TS 101 043 V5.6.0 (1998-11) 37 GSM 03.18 version 5.6.0 Release 1996 Procedure to send an Alerting message to the MS if one is required for this call Procedure Send_Alerting_If_Required SALTIR1(1) Signals to the left are to the BSS Alerting sent Access Connect sent Backward call indicator= no indication? Progress Alerting Alerting sent:= True False No Yes No True True Figure 15: Procedure Send_Alerting_If_Required ETSI TS 101 043 V5.6.0 (1998-11) 38 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to determine the COLP information to be sent to the MS Procedure Set_COLP_Info_MSC COINF_M1(1) Signals to/from the right are to/from the process COLP_MAF006 Initiate handling of COLP Wait_For_ COLP_Info Release transaction From BSS Continue call handling Release From destination exchange Figure 16: Procedure Set_COLP_Info_MSC ETSI TS 101 043 V5.6.0 (1998-11) 39 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to handle AoC signalling towards the MS for an MO call Procedure Handle_AoC_MO_MSC AoCMO_M1(1) AoC(I) provisioned? AoC(C) provisioned? Acknowledgment required:= False Set charging parameters Acknowledgment required:= True Set charging parameters No No Yes Yes Figure 17: Procedure Handle_AoC_MO_MSC ETSI TS 101 043 V5.6.0 (1998-11) 40 GSM 03.18 version 5.6.0 Release 1996 Procedure to send a Connect message to the MS if one is required for this call Procedure Send_Access_Connect_If_Required SACONIR1(1) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the destination exchange MS connected Facility Acknowledgment required? Start AoC acknowledgment timer Wait_For_ AoC_Ack_P Charging Parameters ack Result:= Facility sent Release transaction Release Release call resources Result:= Fail AoC acknowledgment timer expired Release transaction Connect Acknowledgment required? Start AoC acknowledgment timer Wait_For_ AoC_Ack_C Charging Parameters ack Result:= Connect sent Release transaction Release Release call resources Result:= Fail Connect Ack Release transaction AoC acknowledgment timer expired True Yes No False Yes No Figure 18: Procedure Send_Access_Connect_If_Required ETSI TS 101 043 V5.6.0 (1998-11) 41 GSM 03.18 version 5.6.0 Release 1996
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7.1.2 Functional requirements of VLR
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7.1.2.1 Process OCH_VLR
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7.1.2.2 Procedure Process_Access_Request_VLR
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Sheet 1: it is a network operator decision (subject to MoU requirements) how often an MS should be authenticated. Sheet 2: the processes Update_Location_VLR and Subscriber_Present_VLR are described in ETS 300 599 [17]. Sheet 2: it is a network operator decision (subject to MoU requirements) whether a connection should be ciphered. Sheet 3: it is a network operator decision (subject to MoU requirements) how often an IMEI should be checked. Sheet 5: it is a network operator decision whether emergency calls are allowed from an ME with no SIM.
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7.1.2.3 Procedure OG_Call_Subscription_Check_VLR
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Sheet 1: it is an implementation option to carry out the check for operator determined barring of all outgoing calls before the check on provisioning of the requested basic service. Sheet 1: the procedure OG_CUG_Check is specific to CUG. If the VLR does not support CUG, processing continues from the "Yes" exit of the test "Result=Call allowed?". Sheet 1: the procedure Get_LI_Subscription_Info_MO_VLR is specific to CLIR and COLP. If the VLR supports neither CLIR nor COLP, the procedure call is omitted. Sheet 1: the procedure Get_AoC_Subscription_Info_VLR is specific to AoC. Sheet 1: the procedure CAMEL_OCH_VLR is specific to CAMEL; it is specified in TS 101 044 [5]. If the VLR does not support CAMEL, processing continues from connector 1 to the call to the procedure Check_OG_Barring. Sheet 2: the negative response "call barred" indicates whether the reason is operator determined barring or supplementary service barring, according to the result returned by the procedure Check_OG_Barring.
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7.1.2.4 Procedure Obtain_Identity_VLR
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It is a network operator decision whether open (unciphered) identification of the MS by its IMSI is allowed.
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7.1.2.5 Procedure Obtain_IMSI_VLR
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7.1.2.6 Procedure Authenticate_VLR
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Sheet 1: the number of unused authentication sets which triggers the VLR to request further authentication sets from the HLR is an operator option.
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7.1.2.7 Procedure Obtain_Authentication_Sets_VLR
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7.1.2.8 Procedure Start_Tracing_VLR
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7.1.2.9 Procedure Check_IMEI _VLR
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If the response from the EIR to a request to check an IMEI is: - blacklisted, then service is not granted; - greylisted, then service is granted, but the network operator may decide to initiate tracing; - whitelisted, then service is granted. ETSI TS 101 043 V5.6.0 (1998-11) 42 GSM 03.18 version 5.6.0 Release 1996
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7.1.2.10 Procedure Obtain_IMEI _VLR
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7.1.2.11 Process Fetch_Authentication_Sets_VLR
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7.1.2.12 Procedure Check_BAOC
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Sheet 1: if the VLR receives an Abort message from the MSC while it is awaiting a response from the process MAF017, the message is saved for handling after return from the procedure.
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7.1.2.13 Procedure OG_CUG_Check
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If the VLR receives an Abort message from the MSC while it is awaiting a response from the process MAF014, the message is saved for handling after return from the procedure.
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7.1.2.14 Procedure Get_LI_Subscription_Info_MO_VLR
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If the VLR does not support CLIR, it omits the signal interchange with the process CLIR_MAF003. If the VLR does not support COLP, it omits the signal interchange with the process COLP_MAF005. If the VLR receives an Abort message from the MSC while it is awaiting a response from the process CLIR_MAF003 or the process COLP_MAF005, the message is saved for handling after return from the procedure.
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7.1.2.15 Procedure Get_AoC_Subscription_Info_VLR
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The indicator of whether or not AoC is provisioned is global data which can be read by the parent process.
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7.1.2.16 Procedure Check_OG_Barring
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Sheet 2: if the VLR receives an Abort message from the MSC while it is awaiting a response from the process MAF018 or MAF019, the message is saved for handling after return from the procedure. ETSI TS 101 043 V5.6.0 (1998-11) 43 GSM 03.18 version 5.6.0 Release 1996 Process in the VLR to handle an outgoing (MO) call setup request Process OCH_VLR OCH_VLR1(1) Signals to/from the left are to/from the MSC. Idle Process Access Request Process_ Access_ Request_VLR Result= Pass Wait_For_ SIFOC Send Info For Outgoing Call Emergency call? Complete Call Idle OG_Call_ Subscription_ Check_VLR Idle Abort Idle Idle Yes Yes No No Figure 19: Process OCH_VLR ETSI TS 101 043 V5.6.0 (1998-11) 44 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to handle a request from the MS for system access Procedure Process_Access_Request_VLR PAR_VLR1(5) Identity known? Obtain_ Identity_VLR Result= Pass? Identity= IMEI? Authentication required? Authenticate_ VLR Result= Pass? IMSI detached:= False Confirmed by Radio Contact:= True 1 2 Set negative response: System Failure 3 Result= Fail? Set negative response: Unidentified Subscriber 3 Result:= Aborted No Yes No Yes Yes No No Yes No Yes No Yes Figure 20a: Procedure Process_Access_Request_VLR (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 45 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to handle a request from the MS for system access Procedure Process_Access_Request_VLR PAR_VLR2(5) 1 Location info confirmed in HLR Update_ Location_VLR Mobile Not Reachable Flag set? Subscriber_ Present_VLR Data confirmed by HLR Set negative response: Unidentified Subscriber 3 Roaming allowed in current LA? Set negative response: Roaming Not Allowed Tracing required? Start_ Tracing_VLR Ciphering required? 4 5 See GSM 09.02 See GSM 09.02 False Yes False True No Yes Yes Yes No No No True Figure 20b: Procedure Process_Access_Request_VLR (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 46 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to handle a request from the MS for system access Procedure Process_Access_Request_VLR PAR_VLR3(5) Signals to the left are to the MSC. 4 Set Ciphering Mode Identity:= IMSI Process Access Request ack IMEI check required? Check_ IMEI_VLR Result= Pass? TMSI reallocation required? Forward New TMSI Freeze existing TMSI Wait_For_ TMSI_Ack Use Existing TMSI Result:= Pass Result= Fail? IMSI detached:= True Set negative response: Illegal Equipment 3 Result:= Aborted 5 Yes Yes Yes No No Yes No No Figure 20c: Procedure Process_Access_Request_VLR (sheet 3) ETSI TS 101 043 V5.6.0 (1998-11) 47 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to handle a request from the MS for system access Procedure Process_Access_Request_VLR PAR_VLR4(5) Signals from the left are from the MSC. 2 Result= Aborted? Result:= Aborted Result= Procedure Error? Set negative response: System Failure 3 Result= Unknown Subscriber? Result= Unidentified Subscriber? Set negative response: Unidentified Subscriber Set negative response: Illegal Subscriber Wait_For_ TMSI_Ack Forward New TMSI ack Unfreeze existing TMSI Result:= Pass Forward New TMSI negative response Yes No Yes No No Yes No Yes Figure 20d: Procedure Process_Access_Request_VLR (sheet 4) ETSI TS 101 043 V5.6.0 (1998-11) 48 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to handle a request from the MS for system access Procedure Process_Access_Request_VLR PAR_VLR5(5) Signals to the left are to the MSC. 3 CM service type =Emergency call? Emergency call setup allowed without SIM? IMEI required? Obtain_ IMEI_VLR Result= Pass? Identity:= IMEI Process Access Request ack Result:= Pass Result= Fail? Process Access Request negative response Result:= Fail Result:= Aborted Yes Yes Yes Yes No Yes No No No No Figure 20e: Procedure Process_Access_Request_VLR (sheet 5) ETSI TS 101 043 V5.6.0 (1998-11) 49 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to perform subscription checks for an outgoing call Procedure OG_Call_Subscription_Check_VLR OCSCVLR1(2) Basic service provisioned? Check_ BAOC Result= Call barred? OG_CUG_ Check Result= Call allowed? Get_LI_ Subscription_ Info_MO_VLR Get_AoC_ Subscription_ Info_VLR O-CSI present? CAMEL_ OCH_VLR See GSM 03.78 Result= Fail? 1 Set negative response: CUG reject Send Info For Outgoing Call negative response Set negative response: Call barred Set negative response: Basic service not provisioned Bearer service or teleservice Yes No Yes Yes No Yes No No Yes No Figure 21a: Procedure OG_Call_Subscription_Check_VLR (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 50 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to perform subscription checks for an outgoing call Procedure OG_Call_Subscription_Check_VLR OCSCVLR2(2) 1 Check_OG_ Barring Call barred? Set negative response: Call barred Send Info For Outgoing Call negative response Complete Call Yes No Figure 21b: Procedure OG_Call_Subscription_Check _VLR (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 51 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to obtain the identity of an MS Procedure Obtain_Identity_VLR OID_VLR1(1) Identity= IMSI? Identification allowed? Obtain_ IMSI_VLR Result= Pass? IMSI known? Result:= Fail Result:= Pass Result:= Aborted No Yes Yes No Yes No No Yes Figure 22: Procedure Obtain_Identity_VLR ETSI TS 101 043 V5.6.0 (1998-11) 52 GSM 03.18 version 5.6.0 Release 1996 Process in the VLR to obtain the IMSI from the MS via the MSC Procedure Obtain_IMSI_VLR OIMSI_V1(1) Signals to/from the left are to/from the MSC. Provide IMSI Wait_For_ IMSI Abort Result:= Aborted Provide IMSI ack Result:= Pass Figure 23: Procedure Obtain_IMSI_VLR ETSI TS 101 043 V5.6.0 (1998-11) 53 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to authenticate an MS via the MSC Procedure Authenticate_VLR AUT_VLR1(2) Signals to/from the left are to/from the MSC. Authentication sets available? Obtain_ Authentication_ Sets_VLR Result= Pass? Result= Aborted? Result:= Aborted Result= Procedure Error? Result:= Procedure Error Result:= Unknown Subscriber Authenticate Wait_For_ Authenticate_ Result Authenticate ack Received SRES= expected SRES? More authentication sets needed? Fetch_ Authentication_ Sets_VLR Authentication accepted Result:= Pass 1 Abort More authentication sets needed? Fetch_ Authentication_ Sets_VLR Result:= Aborted 2 No No Yes No Yes No Yes Yes Yes No No Yes No Yes Figure 24a: Procedure Authenticate_VLR (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 54 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to authenticate an MS via the MSC Procedure Authenticate_VLR AUT_VLR2(2) Signals to the left are to the MSC. 1 Identity=IMSI? Retry with IMSI? Obtain_ IMSI_VLR Result= Pass? IMSI known? IMSI matches TMSI? Authentication rejected Result:= Illegal Subscriber Identity:= IMSI 2 Authentication accepted Result:= Unidentified Subscriber Result:= Aborted No Yes Yes Yes Yes No No No No Yes Figure 24b: Procedure Authenticate_VLR (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 55 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to obtain authentication sets from the HLR Procedure Obtain_Authentication_Sets_VLR OAS_VLR1(2) Signals to/from the right are to/from the HLR Send Authentication Info Wait_For_ Authentication_ Sets Send Authentication Info ack Empty result? Authentication sets available in VLR? Re-use old sets? Result:= Pass Result:= Procedure Error Send Authentication Info negative response Unknown Subscriber? Result:= Unknown Subscriber Yes Yes Yes No No No No Yes Figure 25a: Procedure Obtain_Authentication_Sets_VLR (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 56 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to obtain authentication sets from the HLR Procedure Obtain_Authentication_Sets_VLR OAS_VLR2(2) Signals to/from the left are to/from the MSC; Signals to/from the right are to/from the HLR Wait_For_ Authentication_ Sets Abort Abort Result:= Aborted Abort Authentication sets available? Re-use old sets? Result:= Pass Result:= Procedure Error Yes Yes No No Figure 25b: Procedure Obtain_Authentication_Sets_VLR (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 57 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to request the MSC to start activity tracing Procedure Start_Tracing_VLR ST_TR_V1(1) Signals to the left are to the MSC. Tracing active? Trace Subscriber Activity No Yes Figure 26: Procedure Start_Tracing_VLR ETSI TS 101 043 V5.6.0 (1998-11) 58 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to request the MSC to check an IMEI Procedure Check_IMEI_VLR CIMEI_V1(1) Signals to/from the left are to/from the MSC Check IMEI Wait_For_ Check_IMEI_ Result Check IMEI ack Service granted? Result:= Fail Result:= Pass Check IMEI negative response Abort Result:= Aborted No Yes Figure 27: Procedure Check_IMEI_VLR ETSI TS 101 043 V5.6.0 (1998-11) 59 GSM 03.18 version 5.6.0 Release 1996 Process in the VLR to obtain the IMSI from the MS via the MSC Procedure Obtain_IMEI_VLR OIMEI_V1(1) Signals to/from the left are to/from the MSC Provide IMEI Wait_For_ IMEI Abort Result:= Aborted Provide IMEI ack Result:= Pass Figure 28: Procedure Obtain_IMEI _VLR ETSI TS 101 043 V5.6.0 (1998-11) 60 GSM 03.18 version 5.6.0 Release 1996 Process in the VLR to retrieve authentication sets from the HLR Process Fetch_Authentication_Sets_VLR FAS_VLR1(1) Obiain_ Authentication_ Sets_VLR Figure 29: Process Fetch_Authentication_Sets_VLR ETSI TS 101 043 V5.6.0 (1998-11) 61 GSM 03.18 version 5.6.0 Release 1996 Procedure to check call request against ODBAOC and SS BAOC Procedure Check_BAOC CBAOC1(1) Signals to/from the right are to/from the process MAF017 Operator determined BAOC imposed? Result:= Call barred (ODB) Initiate handling of BAOC Wait_For_ BAOC_ Response Abort Continue call handling Call barred? Result:= Call barred (SS barring) Result:= Call allowed From MSC Yes No Yes No Figure 30: Procedure Check_BAOC ETSI TS 101 043 V5.6.0 (1998-11) 62 GSM 03.18 version 5.6.0 Release 1996 Procedure to carry out CUG authorisation check for an outgoing (MO) call Procedure OG_CUG_Check OG_CUG1(1) Signals to/from the right are to/from the process CUG_MAF014 outgoing call request Wait_For_ CUG_Response Abort reject call (cause) Result:= Call barred complete call (conditional CUG info) Result:= Call allowed response to call request From MSC Figure 31: Procedure OG_CUG_Check ETSI TS 101 043 V5.6.0 (1998-11) 63 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to retrieve subscription information for the CLIR & COLP line identification services for an MO call Procedure Get_LI_Subscription_Info_MO_VLR GLI_MOV1(1) Initiate handling of CLIR Wait_For_ CLIR_Info Abort Continue call handling Initiate handling of COLP Wait_For_ COLP_Info Abort Continue call handling From process COLP_MAF005 To process COLP_MAF005 From process CLIR_MAF003 To process CLIR_MAF003 From MSC From MSC Figure 32: Procedure Get_LI_Subscription_Info_MO_VLR ETSI TS 101 043 V5.6.0 (1998-11) 64 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to determine the subscription to Advice of Charge services Procedure Get_AoC_Subscription_Info_VLR GAOCI_V1(1) AoC(I) provisioned? AoC(C) provisioned? Set indicator: AoC not provisioned Set indicator: AoC(C) provisioned Set indicator: AoC(I) provisioned No No Yes Yes Figure 33: Procedure Get_AoC_Subscription_Info_VLR ETSI TS 101 043 V5.6.0 (1998-11) 65 GSM 03.18 version 5.6.0 Release 1996 Procedure to check call request against SS barring and ODB categories Procedure Check_OG_Barring COB1(3) Operator determined BOIC imposed? Destination address CC= Local CC? 1 Operator determined BOIC-exHC imposed? Destination address CC= Local CC? 1 Destination address CC= HPLMN CC? 1 Operator determined BOIZC imposed? Destination address ZC= Local ZC? 1 Operator determined BOIZC-exHC imposed? Destination address ZC= Local ZC? 1 Destination address CC= HPLMN CC? Result:= Call barred (ODB) 1 Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No No Yes Figure 34a: Procedure Check_OG_Barring (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 66 GSM 03.18 version 5.6.0 Release 1996 Procedure to check call request against SS barring and ODB categories Procedure Check_OG_Barring COB2(3) 1 Operator determined BOIC-exHC&BOIZC imposed? 2 Destination address ZC= Local ZC? Destination address CC= Local CC? 2 Destination address CC= HPLMN CC? Result:= Call barred (ODB) 2 No Yes Yes Yes No No Yes No Figure 34b: Procedure Check_OG_Barring (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 67 GSM 03.18 version 5.6.0 Release 1996 Procedure to check call request against SS barring and ODB categories Procedure Check_OG_Barring COB3(3) 2 Initiate handling of BOIC To process MAF018 Wait_For_ BOIC_ Response Abort From MSC Continue call handling From process MAF018 Call barred? Initiate handling of BOIC-exHC To process MAF020 Wait_For_ BOIC-exHC_ Response Abort From MSC Continue call handling From process MAF020 Call barred? Result:= Call barred (SS barring) Result:= Call allowed No Yes No Yes Figure 34c: Procedure Check_OG_Barring (sheet 3) ETSI TS 101 043 V5.6.0 (1998-11) 68 GSM 03.18 version 5.6.0 Release 1996
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7.2 Retrieval of routeing information for MT call
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7.2.1 Functional requirements of GMSC
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7.2.1.1 Process MT_GMSC
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Sheet 1: the variables ACM sent, Answer sent and Network connect sent are global data, accessible to the procedures Send_ACM_If_Required, Send_Answer_If_Required and Send_Network_Connect_If_Required. Sheet 1: the procedure OR_Set_ORA_Parameters is specific to Support of Optimal Routeing; it is specified in TS 101 045 [6]. Sheet 1: the procedure CAMEL_Set_ORA_Parameters is specific to CAMEL; it is specified in TS 101 044 [5]. Sheet 1: the parameters “Reference address”, “OR” and “Own PLMN” are passed to the procedure Obtain_Routeing_Address only if the GMSC supports Optimal Routeing. The parameter “Destination address” is returned by the procedure Obtain_Routeing_Address only if the GMSC supports Optimal Routeing of mobile-to-mobile calls. The Send Routeing Info negative response information element received in the execution of the procedure Obtain_Routeing_Address is global data, available to the parent process. Sheet 1: the suggested mapping from values of the Send Routeing Info negative response information element to values of the ISUP release cause (see ITU-T Recommendation Q.850 [22]) is shown in table 1. The mapping used is a matter for the network operator, depending on the telephony signalling system used. Table 1: Suggested mapping of Send Routeing Info (SRI) negative responses to ISUP release causes SRI negative response ISUP release cause number ISUP release cause name Absent subscriber 20 Subscriber absent Bearer service not provisioned 57 Bearer capability not authorised Call barred (ODB) 21 Call rejected Call barred (SS barring) 21 Call rejected CUG reject (Called party SS interaction violation) 21 Call rejected CUG reject (Incoming calls barred within CUG) 55 Incoming calls barred within CUG CUG reject (Subscriber not member of CUG) 87 User not member of CUG CUG reject (Requested basic service violates CUG constraints) 87 User not member of CUG Data missing 111 Protocol error, unspecified Facility not supported 69 Requested facility not implemented Forwarding violation 21 Call rejected Number changed 22 Number changed System failure 111 Protocol error, unspecified Teleservice not provisioned 57 Bearer capability not authorised Unexpected data value 111 Protocol error, unspecified Unknown subscriber 1 Unallocated (unassigned) number Sheet 1: the called party address sent in the IAM to the process MT_CF_MSC is the Forwarded-to number received in the Perform Call Forwarding ack. Sheet 1: it is an operator option whether to send an Address Complete message if the HLR returns forwarding information. If the GMSC sends an Address Complete message, it shall include the called party’s status field of the Backward call indicator set to "no indication". Sheet 2: the procedure CAMEL_MT_GMSC_Answer is specific to CAMEL; it is specified in TS 101 044 [5]. If the GMSC does not support CAMEL, processing continues from the "No" exit of the test "Result=Fail?". Sheet 2: the task “Set destination address parameter” is executed only if the GMSC supports Optimal Routeing of mobile-to-mobile calls. Sheet 2: the procedure Handle_COLP_Forwarding_Interaction is specific to COLP. ETSI TS 101 043 V5.6.0 (1998-11) 69 GSM 03.18 version 5.6.0 Release 1996 Sheet 3: the input signal Resume Call Handling and all the subsequent processing on this sheet are specific to Support of Optimal Routeing, and will occur only if the GMSC supports Optimal Routeing. The procedure OR_Handle_RCH is specified in TS 101 045 [6]. Sheet 4: the procedures CAMEL_MT_GMSC_DISC1 and CAMEL_MT_GMSC_DISC2 are specific to CAMEL; they are specified in TS 101 044 [5]. If the GMSC does not support CAMEL, processing continues from the "No" exit of the test "Result=CAMEL handling?". Sheet 4: the procedure CAMEL_MT_GMSC_DISC3 is specific to CAMEL; it is specified in TS 101 044 [5]. Sheet 4: in both subtrees, the processing in the branch beginning with the Int_Release_Call input will occur only if the MSC supports CAMEL. Sheet 5: after the GMSC has sent an IAM to the destination VMSC or the forwarded-to exchange (via the process MT_CF_MSC), it acts as a relay for messages received from the originating exchange and the destination VMSC or the process MT_CF_MSC. Any message other than Address Complete, Connect, Answer or Release causes no change of state in the process MT_GMSC.
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7.2.1.2 Procedure Obtain_Routeing_Address
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Sheet 1: the variables ACM sent, Answer sent and Network connect sent are global data, accessible to the procedures Send_ACM_If_Required, Send_Answer_If_Required and Send_Network_Connect_If_Required. Sheet 1: The procedure OR_Handle_SRI_Negative_Response is specific to Support of Optimal Routeing. It is specified in TS 101 045 [6]. If the GMSC does not support Optimal Routeing, processing continues from the “No” exit of the test “Result=Pass?”. Sheet 2: the procedure CAMEL_MT_GMSC_INIT is specific to CAMEL; it is specified in TS 101 044 [5]. Sheet 2: the task “Store Forwarding Interrogation Required indicator” is executed only if the GMSC supports Optimal Routeing. Sheet 2: the task “Destination address:=VMSC address” is executed only if the GMSC supports Optimal Routeing of mobile-to-mobile calls. Sheet 2: the procedure Route_Permitted is specific to Support of Optimal Routeing. It is specified in TS 101 045 [6]. If the GMSC does not support Optimal Routeing, processing continues from the “True” exit of the test “Route permitted”. Sheet 2: the tasks “Destination address:=FTN” and "OR:=True" are executed only if the GMSC supports Optimal Routeing of mobile-to-mobile calls. Sheet 2: the procedure CAMEL_MT_MSC_DISC3 is specific to CAMEL; it is specified in TS 101 044 [5]. Sheet 2: if the GMSC does not support CAMEL and the Send Routeing Info ack contains neither an MSRN nor an FTN, processing continues from the “No” exit of the test “CMN?”.
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7.2.1.3 Procedure Send_ACM_If_Required
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If no useful information would be carried in the Progress message, it is not sent.
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7.2.1.4 Procedure Send_Answer_If_Required
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If no useful information would be carried in the Progress message, it is not sent.
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7.2.1.5 Procedure Send_Network_Connect_If_Required
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If no useful information would be carried in the Progress message, it is not sent.
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7.2.1.6 Procedure Handle_COLP_Forwarding_Interaction_MSC
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The originating exchange or the destination exchange may release the call while a response is awaited from the process COLP_MAF039. The message is saved for processing after return from the procedure. ETSI TS 101 043 V5.6.0 (1998-11) 70 GSM 03.18 version 5.6.0 Release 1996
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7.2.1.7 Procedure Activate_CF_Process
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The processing in the branch beginning with the Int_Release_Call input will occur only if the MSC supports CAMEL.
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7.2.1.8 Process MT_CF_MSC
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Sheet 1: the procedure CAMEL_CF_MSC_INIT is specific to CAMEL; it is specified in TS 101 044 [5]. If the MSC does not support CAMEL, processing continues from the "Yes" exit of the test "Result=Pass?". Sheet 1: the processing in the branch beginning with the input signal "OR cancelled" is specific to Support of Optimal Routeing; it will not occur if the MSC does not support OR. Sheet 1: the procedure CAMEL_OCH_MSC_DISC3 is specific to CAMEL; it is specified in TS 101 044 [5]. Sheet 2: the procedure CAMEL_CF_MSC_ANSWER is specific to CAMEL; it is specified in TS 101 044 [5]. If the MSC does not support CAMEL, processing continues from the "No" exit of the test "Result=Fail?". Sheet 3: the procedures CAMEL_OCH_MSC_DISC1 and CAMEL_OCH_MSC_DISC2 are specific to CAMEL; they are specified in TS 101 044 [5]. If the MSC does not support CAMEL, processing continues from the "No" exit of the test "Result=CAMEL handling?". Sheet 3: the procedure CAMEL_OCH_MSC_DISC3 is specific to CAMEL; it is specified in TS 101 044 [5]. Sheet 3: in both subtrees, the processing in the branch beginning with the Int_Release_Call input will occur only if the MSC supports CAMEL. Sheet 4: after the process MT_CF_MSC has sent an IAM to the forwarded-to exchange, it acts as a relay for messages received from the parent process and the forwarded-to exchange. Any message other than Address Complete, Connect, Answer or Release causes no change of state in the process MT_GMSC ETSI TS 101 043 V5.6.0 (1998-11) 71 GSM 03.18 version 5.6.0 Release 1996 Process in the GMSC to handle a mobile-terminated call request Process MT_GMSC MT_GMSC1(5) Signals to/from the left are to/from the originating exchange; signals to/from the right are to/from the destination MSC unless marked otherwise Idle Initial Address OR_Set_ORA_ Parameters See GSM 03.79 CAMEL_Set_ ORA_Parameters See GSM 03.78 Obtain_Routeing_Address (Called party address, Reference address, OR, Own PLMN, Routeing address, Destination address, Result) Result= Forward? Result= Fail? Set cause Release Release call resources Idle Result= Aborted? Initial Address (Routeing Address) Wait_For_ ACM Initial Address (Routeing Address) To process MT_CF_MSC Send_ACM_ If_Required To originating exchange Wait_For_ Forward_ACM No Yes No No Yes Yes Figure 35a: Process MT_GMSC (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 72 GSM 03.18 version 5.6.0 Release 1996 Process in the GMSC to handle a mobile-terminated call request Process MT_GMSC MT_GMSC2(5) Signals from the right in this subtree are from the destination exchange Signals from the right in this subtree are from the process MT_CF_MSC Wait_For_ ACM Address Complete Send_ACM_ If_Required Wait_For_ Answer Answer CAMEL_MT_ GMSC_ANSWER See GSM 03.78 Result= Fail? Idle Set destination address parameter Send_Answer_ If_Required Wait_For_ Clear Connect CAMEL_MT_ GMSC_ANSWER See GSM 03.78 Result= Fail? Idle Set destination address parameter Send_Network_ Connect_If_ Required Wait_For_ Forward_ACM Address Complete Send_ACM_ If_Required Wait_For_ Forward_ Answer Answer CAMEL_MT_ GMSC_ANSWER Result= Fail? Handle_COLP_ Forwarding_ Interaction_MSC Set COLP presentation indicator Set destination address parameter Send_Answer_ If_Required Wait_For_ Clear Connect CAMEL_MT_ GMSC_ANSWER See GSM 03.78 Result= Fail? Handle_COLP_ Forwarding_ Interaction_MSC Set COLP presentation indicator Set destination address parameter Send_Network_ Connect_If_ Required Idle Yes No Yes No Yes No No Yes Figure 35b: Process MT_GMSC (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 73 GSM 03.18 version 5.6.0 Release 1996 Process in the GMSC to handle a mobile-terminated call request Process MT_GMSC MT_GMSC3(5) Signals from the right are from the destination MSC Wait_For_ACM, Wait_For_Answer Resume Call Handling Refer to GSM 03.79 for message contents OR_Handle_ RCH See GSM 03.79 Result= Fail? Result= Refused? - Wait_For_ Forward_ACM Idle No Yes No Yes Figure 35c: Process MT_GMSC (sheet 3) ETSI TS 101 043 V5.6.0 (1998-11) 74 GSM 03.18 version 5.6.0 Release 1996 Process in the GMSC to handle a mobile-terminated call request Process MT_GMSC MT_GMSC4(5) Signals to/from the left are to/from the originating exchange; signals to/from the right are to/from the originating exchange or the process MT_CF_MSC unless marked otherwise Wait_For_ACM, Wait_For_Forward_ACM, Wait_For_Answer, Wait_For_Forward_Answer Release CAMEL_MT_ GMSC_DISC3 See GSM 03.78 Release Release call resources Idle Release CAMEL_MT_ GMSC_DISC3 See GSM 03.78 Release Int_Release_ Call From gsmSSF Release Release Wait_For_ Clear Release CAMEL_MT_ GMSC_DISC1 See GSM 03.78 Result= CAMEL handling? Release Release call resources Idle Release CAMEL_MT_ GMSC_DISC2 See GSM 03.78 Result= CAMEL handling? Release Int_Release_ Call From gsmSSF Release Release No Yes No Yes Figure 35d: Process MT_GMSC (sheet 4) ETSI TS 101 043 V5.6.0 (1998-11) 75 GSM 03.18 version 5.6.0 Release 1996 Process in the GMSC to handle a mobile-terminated call request Process MT_GMSC MT_GMSC5(5) Signals to/from the left are to/from the originating exchange; signals to/from the right are to/from the destination exchange or the process MT_CF_MSC unless marked otherwise Wait_For_ACM, Wait_For_Forward_ACM, Wait_For_Answer, Wait_For_Forward_Answer, Wait_For_Clear * - - * - Figure 35e: Process MT_GMSC (sheet 5) ETSI TS 101 043 V5.6.0 (1998-11) 76 GSM 03.18 version 5.6.0 Release 1996 Procedure in a GMSC to determine the address to which a call should be routed Procedure Obtain_Routeing_Address ORA1(2) Procedure Obtain_Routeing_Address FPAR IN Input address, Reference address, Own PLMN IN/OUT Routeing address, Destination address, OR, Result Signals to/from the left are to/from the originating exchange; signals to/from the right are to/from the HLR Send Routeing Info ACM sent:=False; Answer sent:=False; Network connect sent:=False Wait_for_ Routeing_ Info See also sheet 2 Release Result:= Aborted Send Routeing Info negative response OR_Handle_SRI_ Negative_Response (Own PLMN) See GSM 03.79 Result= Pass? Result:=Fail Result:=Pass No Yes Figure 36a: Procedure Obtain_Routeing_Address (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 77 GSM 03.18 version 5.6.0 Release 1996 Procedure in a GMSC to determine the address to which a call should be routed Procedure Obtain_Routeing_Address ORA2(2) Signals to/from the right are to/from the HLR unless marked otherwise Wait_for_ Routeing_ Info Send Routeing Info ack CAMEL_MT_ GMSC_INIT See GSM 03.78 Result= MSRN? Result= FTN? Activate_ CF_Process Result= Fail? Route_Permitted (OR,FTN, Reference Address) See GSM 03.79 Route permitted CAMEL_MT_ GMSC_DISC3 See GSM 03.78 OR cancelled To process MT_CF_MSC Routeing address:= Reference address Destination address:= Reference address OR:=False Result:= Pass Routeing address:= FTN Destination address:= FTN OR:=True Result:= Forward Result:=Fail Result= Aborted? Result= CMN? Route_Permitted (OR,FTN, Reference Address) Route permitted CAMEL_MT_ GMSC_DISC3 See GSM 03.79 Routeing address:= Reference address Destination address:= Reference address OR:=False Result:= Pass Routeing address:= CMN Destination address:= CMN OR:=True Result:= Pass Result:= Aborted Store Forwarding Interrogation Required indicator Routeing address:= MSRN Destination address:= VMSC address Result:=Pass No Yes No False True Yes No No Yes False True No Yes Yes Figure 36b: Procedure Obtain_Routeing_Address (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 78 GSM 03.18 version 5.6.0 Release 1996 Procedure to send an Address Complete Message to the preceding exchange if one is required for this call Procedure Send_ACM_If_Required SACMIR1(1) Signals to the left are to the originating exchange ACM sent Network connect sent Call Progress Address Complete ACM sent:= True False True False True Figure 37: Procedure Send_ACM_If_Required ETSI TS 101 043 V5.6.0 (1998-11) 79 GSM 03.18 version 5.6.0 Release 1996 Procedure to send an Answer Message to the preceding exchange if one is required for this call Procedure Send_Answer_If_Required SANMIR1(1) Signals to the left are to the originating exchange Answer sent Network connect sent Call Progress Answer Answer sent:= True False True False True Figure 38: Procedure Send_Answer_If_Required ETSI TS 101 043 V5.6.0 (1998-11) 80 GSM 03.18 version 5.6.0 Release 1996 Procedure to send a Connect Message to the preceding exchange if one is required for this call Procedure Send_Network_Connect_If_Required SNCONIR1(1) Signals to the left are to the originating exchange Network connect sent Answer sent ACM sent Answer Answer sent:= True Connect Connect sent:= True Call Progress False False True False True True Figure 39: Procedure Send_Network_Connect_If_Required ETSI TS 101 043 V5.6.0 (1998-11) 81 GSM 03.18 version 5.6.0 Release 1996 Procedure in the GMSC or VMSC to handle the interaction between COLP and Call Forwarding Procedure Handle_COLP_Forwarding_Interaction_MSC COINT_M1(1) Signals to/from the right are to/from the process COLP_MAF039 initiate handling of COLP Wait_For_ COLP_Info Release From originating exchange or destination exchange continue call handling Figure 40: Procedure Handle_COLP_Forwarding_Interaction_MSC ETSI TS 101 043 V5.6.0 (1998-11) 82 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to initiate the process which handles call forwarding Procedure Activate_CF_Process ACFP1(1) Signals to/from the left are to/from the originating exchange; signals to/from the right are to/from the process MT_CF_MSC unless marked otherwise Perform call forwarding(FTN) Wait_For_ CF_Response Release CF cancelled Result:= Fail Perform call forwarding ack Result:= Pass Perform call forwarding negative response Result:= Fail Release Release Result:= Fail Int_Release_ Call From gsmSSF CF cancelled Release Result:= Fail Figure 41: Procedure Activate_Call_Forwarding_Process ETSI TS 101 043 V5.6.0 (1998-11) 83 GSM 03.18 version 5.6.0 Release 1996 Process in the MSC to handle call forwarding Process MT_CF_MSC MTCFMSC1(4) Signals to/from the left are to/from the parent process; signals to/from the right are to/from the destination exchange Idle Perform call forwarding CAMEL_CF_ MSC_INIT See GSM 03.78 Result= Pass? Perform call forwarding ack(FTN) Wait_For_ IAM Initial Address Initial Address Wait_For_ ACM CF cancelled CAMEL_OCH_ MSC_DISC3 See GSM 03.78 Idle Result= Fail? Perform call forwarding negative response Idle Yes No Yes No Figure 42a: Process MT_CF_MSC (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 84 GSM 03.18 version 5.6.0 Release 1996 Process in the MSC to handle call forwarding Process MT_CF_MSC MTCFMSC2(4) Signals to/from the left are to/from the parent process; signals to/from the right are to/from the destination exchange Wait_For_ ACM Address Complete Address Complete Wait_For_ Answer Answer CAMEL_CF_ MSC_ANSWER See GSM 03.78 Result= Fail? Answer Wait_For_ Clear Idle Connect CAMEL_CF_ MSC_ANSWER See GSM 03.78 Result= Fail? Connect No Yes Yes No Figure 42b: Process MT_CF_MSC (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 85 GSM 03.18 version 5.6.0 Release 1996 Process in the MSC to handle call forwarding Process MT_CF_MSC MTCFMSC3(4) Signals to/from the left are to/from the parent process; signals to/from the right are to/from the destination exchange unless marked otherwise Wait_For_ACM, Wait_For_Answer Release CAMEL_OCH_ MSC_DISC3 See GSM 03.78 Release Idle Release CAMEL_OCH_ MSC_DISC3 See GSM 03.78 Release Int_O_ Release From gsmSSF Release Release Wait_For_ Clear Release CAMEL_OCH_ MSC_DISC1 See GSM 03.78 Result= CAMEL Handling? Release Idle Release CAMEL_OCH_ MSC_DISC2 See GSM 03.78 Result= CAMEL Handling? Release Int_O_ Release From gsmSSF Release Release No Yes No Yes Figure 42c: Process MT_CF_MSC (sheet 3) ETSI TS 101 043 V5.6.0 (1998-11) 86 GSM 03.18 version 5.6.0 Release 1996 Process in the MSC to handle call forwarding Process MT_CF_MSC MTCFMSC4(4) Signals to/from the left are to/from the parent process; signals to/from the right are to/from the destination exchange unless marked otherwise * * - - * - Figure 42d: Process MT_CF_MSC (sheet 4) ETSI TS 101 043 V5.6.0 (1998-11) 87 GSM 03.18 version 5.6.0 Release 1996
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7.2.2 Functional requirements of HLR
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7.2.2.1 Process SRI_HLR
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Sheet 1: the procedures Check_Parameters, Subscription_Check_HLR, Handle_OR_HLR_CF and CAMEL_HLR_INIT can set the negative response parameter which is used by the process SRI_HLR to construct the Send Routeing Info negative response message. This negative response parameter is global data, accessible by the process SRI_HLR. Sheet 1: the procedure Handle_OR_HLR_CF is specific to Support of Optimal Routeing; it is specified in TS 101 045 [6]. If the HLR does not support Optimal Routeing, processing continues from the “No” exit of the test “Result=Forward?”. Sheet 1: the procedure CAMEL_HLR_INIT is specific to CAMEL; it is specified in TS 101 044 [5]. If the HLR does not support CAMEL, processing continues from the “No” exit of the test“Result=Fail?”. Sheet 2: the procedure First_Forwarding_HLR can set the negative response parameter which is used by the process SRI_HLR to construct the Send Routeing Info negative response message. This negative response parameter is global data, accessible by the process SRI_HLR. Sheet 2: the procedure CAMEL_CSI_Check_HLR is specific to CAMEL; it is specified in TS 101 044 [5]. If the HLR does not support CAMEL, processing continues from the “No” exit of the test“Result=CSI active?”. Sheet 2: the procedure OR_HLR_Interrogate_VLR is specific to Optimal Routeing. It is specified in TS 101 045 [6]. If the HLR does not support Optimal Routeing, processing continues from the “No” exit of the test “Result=Forward”. Sheet 2: if the HLR does not support Network Indication of Alerting, the test "Alerting pattern required" is omitted. Sheet 3: the procedure PRN_Error_HLR can set the negative response parameter which is used by the process SRI_HLR to construct the Send Routeing Info negative response message. This negative response parameter is global data, accessible by the process SRI_HLR. Sheet 3: the procedure Forward_CUG_Check is specific to CUG. If the HLR does not support CUG, processing continues from the ""Yes" exit of the test "Result=Call allowed?". Sheet 3: the test "Forwarding enquiry" is specific to Support of Optimal Routeing. If the HLR does not support Optimal Routeing, processing continues from the "No" exit of the test. Sheet 3: the procedure CAMEL_CSI_Check_HLR is specific to CAMEL; it is specified in TS 101 044 [5]. If the HLR does not support CAMEL, processing in the branch following the "No" exit of the test "Result=Call allowed?" continues from the “No” exit of the test “Result=CSI active?”. Sheet 3: the procedures CAMEL_T_CSI_CHECK_HLR and CAMEL_O_CSI_CHECK_HLR are specific to CAMEL; they are specified in TS 101 044 [5].
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7.2.2.2 Procedure Check_Parameters
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If any parameters required by the rules in clause 8 are missing from the message, the procedure sets the negative response to "Data missing". If any parameter has a value which is not in the set of values expected for the parameter, the procedure sets the negative response to "Unexpected data value".
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7.2.2.3 Procedure Subscription_Check_HLR
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It is an implementation option to carry out the check for operator determined barring of incoming calls before the check on provisioning of the requested basic service. The negative response "Call barred" indicates whether the reason is operator determined barring or supplementary service barring, according to the result returned by the procedure Check_IC_Barring. The procedure IC_CUG_Check is specific to CUG. If the HLR does not support GUG, processing continues from the "Yes" exit of the test "Result=Call allowed?". The negative response "CUG reject" indicates whether the reason is: ETSI TS 101 043 V5.6.0 (1998-11) 88 GSM 03.18 version 5.6.0 Release 1996 - Incoming calls barred within CUG; - Requested basic service violates CUG constraints; - Subscriber not member of CUG according to the cause returned by the procedure IC_CUG_Check.
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7.2.2.4 Procedure First_Forwarding_HLR
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The MS is not reachable if any of the following conditions is satisfied: - The HLR has no location information for the subscriber; - The subscriber record is marked as MS purged; - The subscriber record is marked as MSC area restricted; - The subscriber record is marked as Roaming Restricted due to Unsupported Feature; - The subscriber is marked as deregistered because of subscription restrictions on roaming
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7.2.2.5 Procedure PRN_Error_HLR
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If the HLR does not support Optimal Routeing, processing starts with the test “Negative response=Facility not supported?”.
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7.2.2.6 Procedure Forward_CUG_Check
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7.2.2.7 Procedure Derive_Requested_Basic_Service_HLR
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The rules for deriving a GSM bearer capability from ISDN compatibility information or the MSISDN of the B subscriber are specified in ETS 300 604 [18]. If a GSM bearer capability cannot be derived from the ISDN compatibility information or the MSISDN of the B subscriber, the HLR applies a default basic service according to the requirements of the operator.
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7.2.2.8 Procedure Check_IC_Barring
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7.2.2.9 Procedure IC_CUG_Check
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7.2.2.10 Procedure Handle_CFU
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The test "Normal call" refers to the value of the indicator returned by the process MAF007.
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7.2.2.11 Procedure Handle_CFNRc
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The test "Mobile subscriber not reachable" refers to the value of the indicator returned by the process MAF010. ETSI TS 101 043 V5.6.0 (1998-11) 89 GSM 03.18 version 5.6.0 Release 1996 Process in the HLR to handle a request for routeing information Process SRI_HLR SRI_HLR1(3) Signals to/from the left are to/from the GMSC; signals to/from the right are to/from the VLR Idle Send Routeing Info Check_ Parameters Result= Pass? Subscription_ Check_HLR Result= Fail? OR_HLR_CF See GSM 03.79 Result= Fail? Result= Forward? CAMEL_ HLR_INIT See GSM 03.78 Result= Fail? 3 1 2 1 Yes No No No No Yes Yes Yes Yes No Figure 43a: Process SRI_HLR (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 90 GSM 03.18 version 5.6.0 Release 1996 Process in the HLR to handle a request for routeing information Process SRI_HLR SRI_HLR2(3) Signals to/from the left are to/from the GMSC; signals to/from the right are to/from the VLR 3 First_ Forwarding_ HLR Result= Fail? Result= Forward? CAMEL_ CSI_Check_ HLR See GSM 03.78 Result= CSI active? 4 OR_HLR_ Interrogate_VLR See GSM 03.79 Result= Fail? Result= Forward? GSM BC= NULL? Set GSM BC parameter Alerting Pattern required ? Wait_For_ MSRN 2 1 2 CAMEL_ CSI_Check_ HLR See GSM 03.78 Result= CSI active? 4 Set Alerting Pattern Provide Roaming Number No No Yes No No No No No Yes Yes Yes Yes Yes Yes No Yes Figure 43b: Process SRI_HLR (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 91 GSM 03.18 version 5.6.0 Release 1996 Process in the HLR to handle a request for routeing information Process SRI_HLR SRI_HLR3(3) Signals to/from the left are to/from the GMSC; signals to/from the right are to/from the VLR Wait_For_ MSRN Provide Roaming Number ack Routeing address:= MSRN Send Routeing Info ack Idle Provide Roaming Number negative response PRN_Error_ HLR Result= Fail? Forward_ CUG_Check Result= Call allowed? Routeing address:= FTN Forwarding enquiry? CAMEL_T_ CSI_CHECK_ HLR CAMEL_O_ CSI_CHECK_ HLR Send Routeing Info ack Idle Forwarding enquiry? CAMEL_ CSI_Check_ HLR Result= CSI active? Set negative response: CUG reject Called party SS interaction violation Send Routeing Info negative response Idle Send Routeing Info ack Idle 1 2 4 No Yes No Yes No No No Yes Yes Yes Figure 43c: Process SRI_HLR (sheet 3) ETSI TS 101 043 V5.6.0 (1998-11) 92 GSM 03.18 version 5.6.0 Release 1996 Procedure to check the parameters of a received message Procedure Check_Parameters Chk_Par1(1) All required parameters present? All parameter values acceptable? Set negative response: Unexpected data value Result:= Fail Result:= Pass Set negative response: Data missing Yes No Yes No Figure 44: Procedure Check_Parameters ETSI TS 101 043 V5.6.0 (1998-11) 93 GSM 03.18 version 5.6.0 Release 1996 Procedure in the HLR to make subscription checks for a mobile- terminated call Procedure Subscription_Check_HLR SC_HLR1(1) MS known? Set negative response: Unknown subscriber Result:= Fail Number changed? Set negative response: Number changed Derive_Requested_ Basic_Service_HLR Requested service provisioned? Set negative response: service not provisioned Bearer service or Teleservice Check_IC_ Barring Result= Call barred? Set negative response: Call barred IC_CUG_ Check Result= Call allowed? Set negative response: CUG reject Result:= Pass No Yes Yes No No Yes Yes No No Yes Figure 45: Procedure Subscription_Check_HLR ETSI TS 101 043 V5.6.0 (1998-11) 94 GSM 03.18 version 5.6.0 Release 1996 Procedure in the HLR to handle call forwarding before interrogation of the VLR Procedure First_Forwarding_HLR FF_HLR1(1) Handle_CFU Result= Fail? Result= Forward? Result:= Forward MS not reachable? Result:= Continue Handle_CFNRc Result= Fail? Result= Forward? Result:= Forward Set negative response: Absent subscriber Result:= Fail Set negative response: Forwarding violation Set negative response: Forwarding violation No Yes No No Yes No Yes No Yes Yes Figure 46: Procedure First_Forwarding_HLR ETSI TS 101 043 V5.6.0 (1998-11) 95 GSM 03.18 version 5.6.0 Release 1996 Procedure in the HLR to handle a negative response for a roaming number request Procedure PRN_Error_HLR PRN_E_H1(1) Negative response=OR not allowed?? Set negative response: OR not allowed Result:= Fail Negative response=Facility not supported? Set negative response: Facility not supported Negative response=Absent subscriber? Negative response=No roaming number? Set negative response: System failure Handle_CFNRc Result= Fail? Set negative response: Forwarding violation Result= Forward? Set negative response: System failure Result:= Forward Handle_CFNRc Result= Fail? Set negative response: Forwarding violation Result:= Fail Result= Forward? Set negative response: Absent subscriber Yes No Yes No No No Yes Yes No No Yes Yes Yes No No Yes Figure 47: Procedure PRN_Error_HLR ETSI TS 101 043 V5.6.0 (1998-11) 96 GSM 03.18 version 5.6.0 Release 1996 Procedure to carry out CUG authorisation check for a forwarded call Procedure Forward_CUG_Check FWD_CUG1(1) Perform Forwarding CUG authorisation CUG authorisation result Result:= Call barred Result:= Call allowed Update CUG info As defined in GSM 03.85 As defined in GSM 03.85 Result:= Call allowed CUG info provided in routeing information request CUG provisioned for forwarding subscriber against requested basic service Yes Fail Pass No No Yes Figure 48: Procedure Forward _CUG_Check ETSI TS 101 043 V5.6.0 (1998-11) 97 GSM 03.18 version 5.6.0 Release 1996 Procedure in the HLR to derive the requested basic service for an incoming (MT) call according to the rules of GSM 09.07 Procedure Derive_Requested_Basic_Service_HLR DRBS_H1(1) Exhaustive ISDN compatibility information available? Multi- numbering? GSM BC:=NULL Basic service:= default Apply GSM BC for this MSISDN Derive basic service from GSM BC Derive GSM BC from ISDN compatibility information No No Yes Yes Figure 49: Procedure Derive_Requested_Basic_Service_HLR ETSI TS 101 043 V5.6.0 (1998-11) 98 GSM 03.18 version 5.6.0 Release 1996 Procedure to check call request against SS barring and ODB categories Procedure Check_IC_Barring CIB1(2) 1 Result:= Call barred (ODB) MS registered in HPLMN zone? Operator determined BIC-RoamHZ imposed? 1 MS registered in HPLMN country? Operator determined BIC-Roam imposed? Operator determined BAIC imposed? No No No Yes Yes No Yes No Yes Yes Figure 50a: Procedure Check_IC_Barring (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 99 GSM 03.18 version 5.6.0 Release 1996 Procedure to check call request against SS barring and ODB categories Procedure Check_IC_Barring CIB2(2) 1 Initiate handling of BAIC Wait_For_ BAIC_ Response Continue call handling Call barred? Initiate handling of BIC-Roam Wait_For_ BIC-Roam_ Response Continue call handling Call barred? Result:= Call barred (SS barring) Result:= Call allowed From process MAF023 To process MAF023 From process MAF022 To process MAF022 No Yes No Yes Figure 50b: Procedure Check_IC_Barring (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 100 GSM 03.18 version 5.6.0 Release 1996 Procedure to carry out CUG authorisation check for an incoming (MT) call Procedure IC_CUG_Check IC_CUG1(1) Signals to/from the right are to/from the process CUG_MAF015 incoming call Wait_For_ CUG_Response reject call (cause) Result:= Call barred (cause) complete call (conditional CUG info) Result:= Call allowed response to call request To process CUG_MAF015 Figure 51: Procedure IC_CUG_Check ETSI TS 101 043 V5.6.0 (1998-11) 101 GSM 03.18 version 5.6.0 Release 1996 Procedure in the HLR to handle Call Forwarding Unconditional Procedure Handle_CFU H_CFU1(1) Signals to/from the right are to/from the process MAF007 initiate handling of CFU Wait_For_ CFU_Result continue call handling Error? Normal call? Result:= Forward Result:= Continue Result:= Fail No No Yes Yes Figure 52: Procedure Handle_CFU ETSI TS 101 043 V5.6.0 (1998-11) 102 GSM 03.18 version 5.6.0 Release 1996 Procedure in the HLR or VLR to handle Call Forwarding on Mobile Subscriber Not Reachable Procedure Handle_CFNRc H_CFNRc1(1) Signals to/from the right are to/from the process MAF010 initiate handling of CFNRc Wait_For_ CFNRc_Result continue call handling Error? Mobile subscriber not reachable? Result:= Not reachable Result:= Forward Result:= Fail No Yes No Yes Figure 53: Procedure Handle_CFNRc ETSI TS 101 043 V5.6.0 (1998-11) 103 GSM 03.18 version 5.6.0 Release 1996
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7.2.3 Functional requirements of VLR
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7.2.3.1 Process PRN_VLR
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Sheet 1: the procedure Check_Parameters is specified in subclause 7.2.2.2. Sheet 2, sheet 3: the procedure CAMEL_SET_SOA is specific to CAMEL; it is specified in TS 101 044 [5]. Sheet 2, sheet 3: the task "Store alerting pattern (if received)" is executed only if the VLR supports the feature Network Indication of Alerting. Sheet 2: the number of unused authentication sets which triggers the VLR to request further authentication sets from the HLR is an operator option. Sheet 2: the process Fetch_Authentication_Sets_VLR is specified in subclause 7.1.2.11.
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7.2.3.2 Process Restore_Subscriber_Data_VLR
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7.2.3.3 Process PSI_VLR
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Sheet 1: the procedure Check_Parameters is specified in subclause 7.2.2.2. If the HLR requests neither location information nor subscriber state, the VLR treats this as a missing parameter. Sheet 2: the task "Set Location Info" encompasses: - Insertion of the cell ID if it was received from the MSC, otherwise retrieval of the stored location area ID; - Derivation of the location number and geographical information from the cell ID or location area ID if the VLR is capable of doing so (the mapping from cell ID and location area to location number is network-specific and outside the scope of the GSM standard); - Insertion of the age of the location information received from the MSC; - Insertion of the VLR number. ETSI TS 101 043 V5.6.0 (1998-11) 104 GSM 03.18 version 5.6.0 Release 1996 Process in the VLR to handle a request for a roaming number Process PRN_VLR PRN_VLR1(3) Signals to/from the left are to/from the HLR. Idle Provide Roaming Number Check_ Parameters Result= Pass? OR indicator present? OR supported? Convert GSM BC to basic service If GSM BC was included in the Provide Roaming Number Service supported by VLR? IMSI known in VLR? 2 IMSI detached? Roaming in LA allowed? Set negative response: Absent subscriber 1 3 Set negative response: Facility not supported Set negative response: OR not allowed Yes Yes Yes Yes No Yes No No Yes Yes No No No No Figure 54a: Process PRN_VLR (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 105 GSM 03.18 version 5.6.0 Release 1996 Process in the VLR to handle a request for a roaming number Process PRN_VLR PRN_VLR2(3) Signals to the left are to the HLR. 2 MSRN available CAMEL_ SET_SOA See GSM 03.78 Allocate MSRN Create IMSI record Location info confirmed in HLR:= False Only if >1 MSC per VLR IMSI detached:= False Allocate LMSI If used by VLR Store compatibility info GSM BC, ISDN BC, ISDN LLC & ISDN HLC (as available) Store Alerting Pattern (if received) Provide Roaming Number ack Fetch_ Authentication_ Sets_VLR Restore_ Subscriber_ Data_VLR Idle Set negative response: No roaming number Provide Roaming Number negative response Idle 1 4 More authentication sets needed? Data confirmed by HLR:=False Confirmed by radio contact:=False Yes No Yes No Figure 54b: Process PRN_VLR (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 106 GSM 03.18 version 5.6.0 Release 1996 Process in the VLR to handle a request for a roaming number Process PRN_VLR PRN_VLR3(3) Signals to the left are to the HLR. 3 MSRN available CAMEL_ SET_SOA See GSM 03.78 MSC per VLR Received MSC number= Stored MSC number Confirmed by radio contact Use received MSC number for MSRN Allocate MSRN Store compatibility info GSM BC, ISDN BC, ISDN LLC & ISDN HLC (as available) Store Alerting Pattern (if received) Provide Roaming Number ack Data confirmed by HLR Idle 4 Use stored MSC number for MSRN Set negative response: No roaming number Provide Roaming Number negative response Idle Yes >1 No False True False True Yes 1 No Figure 54c: Process PRN_VLR (sheet 3) ETSI TS 101 043 V5.6.0 (1998-11) 107 GSM 03.18 version 5.6.0 Release 1996 Process in the VLR to restore subscriber data Process Restore_Subscriber_Data_VLR RSD_VLR1(1) Signals to/from the left are to/from the HLR Restore Data Wait_For_ Data Restore Data ack Update Subscriber Data Update HLR number Update MS Not Reachable indicator If received from HLR Data confirmed by HLR:=True Restore Data negative response Figure 55: Process Restore_Subscriber_Data_VLR ETSI TS 101 043 V5.6.0 (1998-11) 108 GSM 03.18 version 5.6.0 Release 1996 Process in the VLR to handle a request from the HLR for subscriber information Process PSI_VLR PSI_VLR1(2) Signals to/from the left are to/from the HLR; signals to/from the right are to/from the MSC Idle Provide Subscriber Info Check_ Parameters Result= Pass? IMSI known in VLR? Subscriber state requested? IMSI detached? Roaming in LA allowed? Set subscriber state requested Location info requested? Set location info requested Obtain Subscriber Info Wait_For_ MSC_Response Subscriber atate:= Network determined not reachable Location info requested? Provide Subscriber Info ack Idle Subscriber state requested? Subscriber state:= Assumed idle Provide Subscriber Info negative response Idle Yes Yes Yes No Yes Yes No Yes No Yes No No Yes No No No Figure 56a: Process PSI_VLR (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 109 GSM 03.18 version 5.6.0 Release 1996 Process in the VLR to handle a request from the HLR for subscriber information Process PSI_VLR PSI_VLR2(2) Signals to/from the left are to/from the HLR; signals to/from the right are to/from the MSC Wait_For_ MSC_Response Obtain Subscriber Info ack Location info received? Set location info Subscriber state received? Set subscriber state Provide Subscriber Info ack Idle Yes Yes No No Figure 56b: Process PSI_VLR (sheet 2)
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7.2.4 Functional requirements of MSC
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7.2.4.1 Process OSI_MSC
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If the MS is engaged on a circuit-switched call, the state is busy, otherwise assumed idle. ETSI TS 101 043 V5.6.0 (1998-11) 110 GSM 03.18 version 5.6.0 Release 1996 Process in the MSC to handle a request from the VLR for information on the subscriber's location and state Process OSI_MSC OSI_MSC1(1) Signals to/from the left are to/from the VLR Idle Obtain Subscriber Info Location info requested? Set age of location info MS in radio contact? Set cell global identity Subscriber state requested? Set subscriber state Obtain Subscriber Info ack Idle Yes Yes Yes No No No Figure 57: Process OSI_MSC ETSI TS 101 043 V5.6.0 (1998-11) 111 GSM 03.18 version 5.6.0 Release 1996
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7.3 MT call
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7.3.1 Functional requirements of serving MSC
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7.3.1.1 Process ICH_MSC
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Sheet 1: the rules for converting the ISDN BC/LLC/HLC to a GSM bearer service or teleservice are specified in ETS 300 604 [18]. Sheet 1: the variables TCH allocated, ACM sent, Answer sent and Network connect sent are global data, accessible to the procedures Establish_Terminating_TCH_If_Required, Send_ACM_If_Required, Send_Answer_If_Required and Send_Network_Connect_If_Required. Sheet 1: the procedure Process_Access_Request_MSC is specified in subclause 7.1.1.2. Sheet 1, sheet 2: the suggested mapping from values of the Send Info For Incoming Call negative response information element to values of the ISUP release cause (see ITU-T Recommendation Q.850 [22]) is shown in table 2. The mapping used is a matter for the network operator, depending on the telephony signalling system used. Table 2: Suggested mapping of Send Info For Incoming Call (SIFIC) negative responses to ISUP release causes SIFIC negative response ISUP release cause number ISUP release cause name Absent subscriber 20 Subscriber absent Busy subscriber 17 User busy CUG reject (Called party SS interaction violation) 21 Call rejected Forwarding violation 21 Call rejected Impossible call completion 111 Protocol error, unspecified No subscriber reply 19 No answer from user (user alerted) System failure 111 Protocol error, unspecified Unallocated roaming number 111 Protocol error, unspecified Sheet 2: the processing in the branch starting with the input signal"Process Call Waiting" is specific to Call Wait. If the VMSC does not support CW this signal will not be received from the VLR. Sheet 2: the procedure Handle_ORLCF_VMSC is specific to Support of Optimal Routeing. It is specified in TS 100 045 [6]. If the VMSC does not support Optimal Routeing, processing continues from the “No” exit of the test “Result=Aborted?”. Sheet 2: the called party address sent in the IAM to the process MT_CF_MSC is the Forwarded-to number received in the Perform Call Forwarding ack. Sheet 2: it is an operator option whether to send an Address Complete message if the VLR returns forwarding information. If the VMSC sends an Address Complete message, it shall include the called party’s status field of the Backward call indicator set to "no indication". Sheet 2, sheet 3: the procedure Send_ACM_If_Required is specified in subclause 7.2.1.3. Sheet 2: the procedure Activate_CF_Process is specified in subclause 7.2.1.7. Sheet 3: the procedure Send_Answer_If_Required is specified in subclause 7.2.1.4. Sheet 3: the procedure Send_Network_Connect_If_Required is specified in subclause 7.2.1.5. Sheet 3: the procedure Handle_COLP_Forwarding_Interaction is specified in subclause 7.2.1.6. Sheet 5: after the VMSC has sent an IAM to the process MT_CF_MSC, it acts as a transparent relay for messages received from the GMSC and the process MT_CF_MSC. Any message other than Address Complete, Connect, Answer or Release causes no change of state in the process ICH_MSC. ETSI TS 101 043 V5.6.0 (1998-11) 112 GSM 03.18 version 5.6.0 Release 1996
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7.3.1.2 Procedure Page_MS_MSC
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Sheet 1: the test "MS connection exists" takes the "Yes" exit if there is a radio connection established between the MS and the network. Sheet 1: for an SMS or SS page, the test "Call still exists" takes the "Yes" exit if the SMS or SS transaction which led to the page still exists. Sheet 1: the test "SMS or SS page" is not required for the handling of circuit-switched calls, because the VLR will always use a page type of "circuit-switched call", but the more generalized procedure Page_MS_MSC is equally applicable to paging for SMS delivery or network-initiated SS procedures. Sheet 1: the test "MS busy" takes the "Yes" exit if the MS is engaged on a circuit-switched call. Sheet 1: the test "Call in setup" takes the "Yes" exit if the call on which the MS is engaged has not reached the established phase (called party answer). Sheet 1: the test Call waiting" takes the "Yes" exit if a waiting call has been offered to the subscriber but the outcome of offering the call has not been determined. Sheet 1: the negative response Busy Subscriber (More calls possible) includes the basic service which applies for the established call. Sheet 2: the signal input "MS connection established" indicates that the MS has responded to paging, or sent a CM service request for anything other than a circuit-switched call, or completed the location registration procedure.
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7.3.1.3 Procedure Search_For_MS_MSC
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Sheet 1: the test "MS connection exists" takes the "Yes" exit if there is a radio connection established between the MS and the network. Sheet 1: for an SMS or SS page, the test "Call still exists" takes the "Yes" exit if the SMS or SS transaction which led to the page still exists. Sheet 1: the test "SMS or SS page" is not required for the handling of circuit-switched calls, because the VLR will always use a page type of "circuit-switched call", but the more generalized procedure Search_For_MS_MSC is equally applicable to paging for SMS delivery or network-initiated SS procedures. Sheet 1: the test "MS busy" takes the "Yes" exit if the MS is engaged on a circuit-switched call. Sheet 1: the test "Call in setup" takes the "Yes" exit if the call on which the MS is engaged has not reached the established phase (called party answer). Sheet 1: the test "Call waiting" takes the "Yes" exit if a waiting call has been offered to the subscriber but the outcome of offering the call has not been determined. Sheet 1: the negative response Busy Subscriber (More calls possible) includes the basic service which applies for the established call. Sheet 2: the signal input "MS connection established" indicates that the MS has responded to paging, or sent a CM service request for anything other than a circuit-switched call, or completed the location registration procedure.
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7.3.1.4 Procedure Complete_Call_In_MSC
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Sheet 1: the procedure Set_CLIP_Info_MSC is specific to CLIP. Sheet 1: the MSC and the MS may negotiate the bearer capability to be used for the call by the exchange of information in the Setup and Call Confirmed messages. Sheet 2: the procedure Send_ACM_If_Required is specified in subclause 7.2.1.3. Sheet 2, sheet 3: the procedure Handle_AoC_MT_MSC is specific to AoC. If the VMSC does not support AoC, processing continues from the "Yes" exit of the test "Result=Pass?". ETSI TS 101 043 V5.6.0 (1998-11) 113 GSM 03.18 version 5.6.0 Release 1996 Sheet 2, sheet 3: the procedure Set_COL_Presentation_Indicator_MSC is specific to COLP. Sheet 2: the procedure Send_Network_Connect_If_Required is specified in subclause 7.2.1.5. Sheet 3: the procedure Send_Answer_If_Required is specified in subclause 7.2.1.5.
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7.3.1.5 Procedure Process_Call_Waiting_MSC
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Sheet 1: the procedure Set_CLIP_Info_MSC is specific to CLIP. Sheet 1: the MSC and the MS may negotiate the bearer capability to be used for the call by the exchange of information in the Setup and Call Confirmed messages. Sheet 1: the Call Confirmed message indicates "busy" for the successful case. Sheet 1: the procedure Send_ACM_If_Required is specified in subclause 7.2.1.3. Sheets 1 & 2: the Release transaction (reject) message covers all unsuccessful cases not otherwise indicated. Sheet 2: the procedure Handle_AoC_MT_MSC is specific to AoC. If the VMSC does not support AoC, processing continues from the "Yes" exit of the test "Result=Pass?". Sheet 2: the procedure Set_COL_Presentation_Indicator_MSC is specific to COLP. Sheet 2: the procedure Send_Answer_If_Required is specified in subclause 7.2.1.4.
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7.3.1.6 Procedure Set_CLIP_Info_MSC
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The originating exchange may release the call or the MS may terminate the transaction with the network by sending a Release transaction message while a response is awaited from the process CLIP_MAF002. The message is saved for processing after return from the procedure.
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7.3.1.7 Procedure Derive_GSM_BC_MSC
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7.3.1.8 Procedure Establish_Terminating_TCH_If_Required
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7.3.1.9 Procedure Handle_AoC_MT_MSC
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7.3.1.10 Procedure Set_COL_Presentation_Indicator_MSC
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The originating exchange may release the call or the MS may terminate the transaction with the network by sending a Release transaction message while a response is awaited from the process COLP_MAF041. The message is saved for processing after return from the procedure. ETSI TS 101 043 V5.6.0 (1998-11) 114 GSM 03.18 version 5.6.0 Release 1996 Process in the MSC to handle an incoming (MT) call Process ICH_MSC ICH_MSC1(6) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise Idle Initial Address From GMSC Convert ISDN BC/LLC/HLC (if present) to GSM bearer service/teleservice & GSM BC Send Info For Incoming Call TCH allocated:=False ACM sent:=False; Answer sent:=False; Network connect sent:=False Wait_For_ Page_Request Send Info For Incoming Call negative response Set cause Release To GMSC Release call resources Idle Page MS Page_ MS_MSC Result= Pass? Process_ Access_ Request_MSC Result= Pass? Wait_For_ MT_Call_ Result Release To GMSC Release call resources Idle Result= Fail? Release call resources Idle Wait_For_ MT_Call_ Result Send Info For Incoming Call ack Call is to be forwarded 1 Search For MS Search_For_ MS_MSC Result= Pass? Result= Fail Wait_For_ MT_Call_ Result Release call resources Idle Yes Yes No No No Yes Yes No Yes No Figure 58a: Process ICH_MSC (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 115 GSM 03.18 version 5.6.0 Release 1996 Process in the MSC to handle an incoming (MT) call Process ICH_MSC ICH_MSC2(6) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise Wait_For_ MT_Call_ Result Send Info For Incoming Call negative response Set cause Release To GMSC Release transaction Release call resources Idle Complete Call Complete_ Call_In_MSC Result= Pass? Result= Fail Wait_For_ MT_Call_ Result Release call resources Idle Wait_For_ Clear Process Call Waiting Process_ Call_ Waiting_MSC Result= Pass? Result= Fail Release call resources Idle Wait_For_ Clear No Yes No Yes No Yes No Yes Figure 58b: Process ICH_MSC (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 116 GSM 03.18 version 5.6.0 Release 1996 Process in the MSC to handle an incoming (MT) call Process ICH_MSC ICH_MSC3(6) Signals to/from the right are to/from the VLR unless marked otherwise Wait_For_ MT_Call_ Result Send Info For Incoming Call ack Call is to be forwarded Handle_ ORLCF_VMSC See GSM 03.79 Result= Clear? Result= Aborted? Set redirection information Send_ACM_ If_Required Activate_ CF_Process Result= Fail? Initial Address Message To process MT_CF_MSC Wait_For_ Forward_ACM Idle Idle Wait_For_ Clear 1 No No No Yes Yes Yes Figure 58c: Process ICH_MSC (sheet 3) ETSI TS 101 043 V5.6.0 (1998-11) 117 GSM 03.18 version 5.6.0 Release 1996 Process in the MSC to handle an incoming (MT) call Process ICH_MSC ICH_MSC4(6) Signals to/from the left are to/from the GMSC; signals to/from the right are to/from the process MT_CF_MSC Wait_For_ Forward_ACM Release Release Release call resources Idle Release Release Address Complete Send_ACM_ If_Required Wait_For_ Forward_Answer Release Release Release call resources Idle Release Release Answer Handle_COLP_ Forwarding_ Interaction_MSC Set COLP presentation indicator Send_Answer_ If_Required Wait_For_ Forward_Clear Connect Handle_COLP_ Forwarding_ Interaction_MSC Set COLP presentation indicator Send_Network_ Connect_ If_Required Figure 58d: Process ICH_MSC (sheet 4) ETSI TS 101 043 V5.6.0 (1998-11) 118 GSM 03.18 version 5.6.0 Release 1996 Process in the MSC to handle an incoming (MT) call Process ICH_MSC ICH_MSC5(6) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the GMSC unless otherwise indicated Wait_For_ MT_Call_ Result Release transaction Release Abort To VLR Release call resources Idle Release Release transaction Wait_For_ Clear Release transaction Release Release call resources Idle Release Release transaction Figure 58e: Process ICH_MSC (sheet 5) ETSI TS 101 043 V5.6.0 (1998-11) 119 GSM 03.18 version 5.6.0 Release 1996 Process in the MSC to handle an incoming (MT) call Process ICH_MSC ICH_MSC6(6) Signals to/from the left are to/from the GMSC; signals to/from the right are to/from the process MT_CF_MSC Wait_For_ Forward_Clear Release Release Release call resources Idle Release Release Wait_For_Forward_ACM, Wait_For_Forward_Answer, Wait_For_Forward_Clear * - - * - Figure 58f: Process ICH_MSC (sheet 6) ETSI TS 101 043 V5.6.0 (1998-11) 120 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to page an MS in a specified location area Procedure Page_MS_MSC PAGE_M1(2) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise Location area ID known? Set negative response: Unknown LAI Page MS negative response Result:= Fail Call still exists? Set negative response: System Failure MS connection exists? SMS or SS page? MS busy? Call in setup? Call waiting? Set negative response: Busy Subscriber More calls possible Set negative response: Busy Subscriber (NDUB) Set access connection status Result:= Pass Clear received:= False Page In specified location area Start Page response timer Wait_For_ Page_ Response No Yes No Yes Yes No Yes No No Yes Yes No Yes No Figure 59a: Procedure Page_MS_MSC (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 121 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to page an MS in a specified location area Procedure Page_MS_MSC PAGE_M2(2) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise Wait_For_ Page_ Response MS connection established Clear received Set access connection status Result:= Pass Release transaction Result:= Aborted Release From GMSC Abort Clear received:= True Wait_For_ Page_ Response Page response timer expired Clear received Set negative response: Absent Subscriber Page MS negative response Result:= Fail Result:= Aborted CM Service Request For circuit- switched call CM Service Request To process OCH_MSC Clear received Set negative response: Busy Subscriber (NDUB) Page MS negative response Result:= Fail Result:= Aborted False True False True False True Figure 59b: Procedure Page_MS_MSC (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 122 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to search for an MS (page in all location areas) Procedure Search_For_MS_MSC SRCH_M1(2) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise Call still exists? MS connection exists? SMS or SS page? MS busy? Call in setup? Call waiting? Set negative response: Busy Subscriber More calls possible Search For MS negative response Result:= Fail Set negative response: Busy Subscriber (NDUB) Set access connection status Result:= Pass Clear received:= False Page In all location areas Start Page response timer Wait_For_ Search_ Response Set negative response: System Failure Yes Yes No Yes No No Yes Yes No Yes No No Figure 60a: Procedure Search_For_MS_MSC (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 123 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to search for an MS (page in all location areas) Procedure Search_For_MS_MSC SRCH_M2(2) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise Wait_For_ Search_ Response MS connection established Clear received Search For MS ack Set access connection status Result:= Pass Release transaction Result:= Aborted Release From GMSC Abort Clear received:= True Wait_For_ Search_ Response Page response timer expired Clear received Set negative response: Absent Subscriber Search For MS negative response Result:= Fail Result:= Aborted CM Service Request For circuit- switched call CM Service Request To process OCH_MSC Clear received Set negative response: Busy Subscriber (NDUB) Search For MS negative response Result:= Fail Result:= Aborted False True False True False True Figure 60b: Procedure Search_For_MS_MSC (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 124 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to complete an MT call on request from the VLR Procedure Complete_Call_In_MSC CCI_MSC1(4) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise Set_CLIP_ Info_MSC Derive_ GSM_BC_ MSC Setup Wait_For_ Setup_ Response Call Confirmed Establish_ Terminating_ TCH_If_ Required Result= Fail? Result= Aborted Abort Result:= Aborted Wait_For_ Alerting Set negative response: Radio congestion Complete Call negative response Result:= Fail Setup failure Set negative response: Absent Subscriber Complete Call negative response Result:= Fail No Yes No Yes Figure 61a: Procedure Complete_Call_In_MSC (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 125 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to complete an MT call on request from the VLR Procedure Complete_Call_In_MSC CCI_MSC2(4) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise Wait_For_ Alerting Alerting NRCT provided? Start No Reply Call Timer Send_ACM_ If_Required To GMSC Wait_for_ Answer Connect Handle_AoC_ MT_MSC Result= Pass? Connect ack Set_COL_ Presentation_ Indicator_MSC Send_Network_ Connect_If_ Required To GMSC Complete Call ack Result:= Pass Release To GMSC Abort Result:= Aborted Alerting failure Abort Release To GMSC Result:= Aborted Yes No Yes No Figure 61b: Procedure Complete_Call_In_MSC (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 126 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to complete an MT call on request from the VLR Procedure Complete_Call_In_MSC CCI_MSC3(4) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise Wait_for_ Answer No Reply Call Timer expired Set negative response: No subscriber reply Complete Call negative response Release transaction Result:= Fail Connect Handle_AoC_ MT_MSC Result= Pass? Connect ack Set_COL_ Presentation_ Indicator_MSC Send_Answer_ If_Required To GMSC Complete Call ack Result:= Pass Release To GMSC Abort Result:= Aborted Yes No Figure 61c: Procedure Complete_Call_In_MSC (sheet 3) ETSI TS 101 043 V5.6.0 (1998-11) 127 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to complete an MT call on request from the VLR Procedure Complete_Call_In_MSC CCI_MSC4(4) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise Wait_For_Setup_Response, Wait_For_Alerting, Wait_For_Answer Release transaction User busy? Set negative response: Busy subscriber (UDUB) Complete Call negative response Result:= Fail Release To GMSC Abort Result:= Aborted Release From GMSC Release transaction Yes No Figure 61d: Procedure Complete_Call_In_MSC (sheet 4) ETSI TS 101 043 V5.6.0 (1998-11) 128 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to handle a Process Call Waiting request from the VLR Procedure Process_Call_Waiting_MSC PCW_MSC1(3) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise Call being set up Set_CLIP_ Info_MSC Derive_ GSM_BC_ MSC Setup Wait_For_ Setup_ Response Call Confirmed Wait_For_ Alerting Alerting NRCT provided? Start No Reply Call Timer Send_ACM_ If_Required To GMSC of waiting call Wait_For_ Acceptance Start Acceptance timer Alerting failure Abort Release To GMSC of waiting call Result:= Aborted Release transaction (UDUB) Set negative response: Busy subscriber Process Call Waiting negative response Result:= Fail Release transaction (reject) Release To GMSC of waiting call Abort Result:= Aborted Setup failure Clear pending call Set negative response: Busy subscriber Process Call Waiting negative response Result:= Fail No Yes No Yes Figure 62a: Procedure Process_Call_Waiting_MSC (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 129 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to handle a Process Call Waiting request from the VLR Procedure Process_Call_Waiting_MSC PCW_MSC2(3) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise Wait_for_ Acceptance Connect Establish_ Terminating_ TCH_If_ Required Result= Pass? Handle_AoC_ MT_MSC Result= Pass? Connect ack Set_COL_ Presentation_ Indicator_MSC Send_ Answer_If_ Required To GMSC of waiting call Process Call Waiting ack Result:= Pass Release To GMSC of waiting call Abort Result:= Aborted Result= Aborted? Abort Release call resources For waiting call Result:= Aborted Yes Yes No No No Yes Figure 62b: Procedure Process_Call_Waiting_MSC (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 130 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to handle a Process Call Waiting request from the VLR Procedure Process_Call_Waiting_MSC PCW_MSC3(3) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the VLR unless marked otherwise Wait_for_ Acceptance Release transaction (busy) Set negative response: Busy subscriber Process Call Waiting negative response Result:= Fail Release transaction (reject) Release To GMSC of waiting call Abort Result:= Aborted Acceptance timer expired Release transaction For waiting call No Reply Call Timer expired Set negative response: No subscriber reply Process Call Waiting negative response Release transaction For waiting call Result:= Fail Wait_For_Setup_Response, Wait_For_Alerting, Wait_For_Acceptance Release From GMSC of waiting call Release transaction For waiting call Abort Release call resources For waiting call Result:= Aborted Figure 62c: Procedure Process_Call_Waiting_MSC(sheet 3) ETSI TS 101 043 V5.6.0 (1998-11) 131 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to determine the CLIP information to be sent to the MS Procedure Set_CLIP_Info_MSC CAINF_M1(1) Signals to/from the right are to/from the process CLIP_MAF002 Initiate handling of CLIP Wait_For_ CLIP_Info Release transaction From BSS Continue call handling Release From GMSC Figure 63: Procedure Set_CLIP_Info_MSC ETSI TS 101 043 V5.6.0 (1998-11) 132 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to derive the requested GSM BC for an incoming (MT) call according to the rules of GSM 09.07 Procedure Derive_GSM_BC_MSC DRBC_M1(1) GSM BC derived from ISDN compatibility information? Use GSM BC derived from ISDN compatibility information GSM BC received in PRN? Omit GSM BC from Setup Use GSM BC received in PRN Yes No No Yes Figure 64: Derive_GSM_BC_MSC ETSI TS 101 043 V5.6.0 (1998-11) 133 GSM 03.18 version 5.6.0 Release 1996 Procedure in the terminating VMSC to establish a Traffic Channel if one has not been established for this call Procedure Establish_Terminating_TCH_If_Required ETTCIR1(1) Signals to/from the left are to/from the BSS; signals to/from the right are to/from the GMSC TCH allocated Allocate channel Wait_For_ Allocation_ Complete Release transaction Result:= Fail Allocation failure Release transaction Allocation complete TCH allocated:= True Result:= Pass Release Release transaction Result:= Aborted Result:= Pass False True Figure 65: Procedure Establish_Terminating_TCH_If_Required ETSI TS 101 043 V5.6.0 (1998-11) 134 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to handle AoC signalling towards the MS for an MT call Procedure Handle_AoC_MT_MSC AOCMT_M1(1) Signals to/from the left are to/from the BSS; signals from the right are from the AoC timer function. AoC(I) provisioned? Set charging parameters Send Charging Parameters Result:= Pass AoC(C) provisioned? Set charging parameters Send Charging Parameters Start AoC acknowledgment timer Wait_For_ Charging_ Parameters_ Ack Charging Parameters ack Release connection Result:= Fail AoC acknowledgment timer expired Release transaction Yes No No Yes Figure 66: Procedure Handle_AoC_MT_MSC ETSI TS 101 043 V5.6.0 (1998-11) 135 GSM 03.18 version 5.6.0 Release 1996 Procedure in the MSC to determine the COL presentation indicator value Procedure Set_COL_Presentation_Indicator_MSC COIND_M1(1) Signals to/from the right are to/from the process COLR_MAF041 Initiate handling of COLR Wait_For_ COLR_Info Release transaction From BSS Continue call handling Release From GMSC Figure 67: Procedure Set_COL_Presentation_Indicator MSC ETSI TS 101 043 V5.6.0 (1998-11) 136 GSM 03.18 version 5.6.0 Release 1996
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7.3.2 Functional requirements of VLR
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7.3.2.1 Process ICH_VLR
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Sheet 1: if the MSRN received in the Send Info For Incoming Call is not allocated or there is no IMSI record for the IMSI identified by the MSRN, this is treated as an unknown MSRN. Sheet 2: the test "NDUB?" takes the "Yes" exit if the Page MS negative response or the Search for MS negative response had the value Busy Subscriber (NDUB). Sheet 2: the procedure Get_CW_Subscription_Info_VLR is specific to Call Waiting. If the VLR does not support Call Waiting, processing continues from the "No" exit of the test "CW available?". Sheet 2: the VLR uses the basic service returned in the Page MS negative response or the Search for MS negative response Busy Subscriber (More calls possible) to determine whether call waiting is available. Sheet 2: the procedure Get_LI_Subscription_Info_MT_VLR is specific to CLIP and COLR. If the VLR supports neither CLIP nor COLR, the procedure call is omitted. Sheet 2: the procedure Get_AoC_Subscription_Info_VLR is specific to AoC; it is specified in subclause 7.1.2.15. Sheet 2: the procedure Process_Access_Request_VLR is specified in subclause 7.1.2.2. Sheet 2: if the VLR does not support CUG, handling continues from the "No" exit of the test "CUG info present?". Sheet 5: the procedure Handle_CFNRc is specified in subclause 7.2.2.11. Sheet 6: the procedure Forward_CUG_Check is specific to CUG; it is specified in subclause 7.2.2.6. If the VLR does not support CUG, processing continues from the "Yes" exit of the test "Result=Call allowed?".
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7.3.2.2 Procedure Derive_Requested_Basic_Service_VLR
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If the VLR did not receive a basic service for the call in the Send Info For Incoming Call, and did not receive a GSM bearer capability in the Provide Roaming Number, it applies a default basic service according to the requirements of the operator.
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7.3.2.3 Procedure Search_For_MS_VLR
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7.3.2.4 Procedure Get_CW_Subscription_Info_VLR
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The MSC may abort the transaction with the VLR while a response is awaited from the process MAF013. The message is saved for processing after return from the procedure.
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7.3.2.5 Procedure Get_LI_Subscription_Info_MT_VLR
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The MSC may abort the transaction with the VLR while a response is awaited from the process CLIP_MAF001 or the process COLR_MAF040. The message is saved for processing after return from the procedure.
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7.3.2.6 Procedure Handle_CFB
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The test "Normal call busy" refers to the value of the indicator returned by the process MAF008.
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7.3.2.7 Procedure Handle_CFNRy
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The test "Normal call" refers to the value of the indicator returned by the process MAF009. ETSI TS 101 043 V5.6.0 (1998-11) 137 GSM 03.18 version 5.6.0 Release 1996 Process in VLRB to handle a request for information for an incoming (MT) call Process ICH_VLR ICH_VLR1(6) Signals to/from the left are to/from the MSC. Idle Send Info For Incoming Call MSRN known? Data confirmed by HLR Set negative response: System Failure Send Info For Incoming Call negative response Idle Derive_Requested_ Basic_Service_VLR IMSI detached? Roaming in LA allowed? Location area ID known? Search_For_ MS_VLR Result= Pass? Result= Fail? Idle 2 Wait_For_ Access_ Request Page MS Page type= circuit-switched call 1 Set negative response: Unallocated Roaming Number Yes False True No Yes No No No Yes Yes Yes No Yes No Figure 68a: Process ICH_VLR (sheet 1) ETSI TS 101 043 V5.6.0 (1998-11) 138 GSM 03.18 version 5.6.0 Release 1996 Process in VLRB to handle a request for information for an incoming (MT) call Process ICH_VLR ICH_VLR2(6) Signals to/from the left are to/from the MSC. Wait_For_ Access_ Request Page MS negative response Absent subscriber? 1 Busy subscriber? 3 NDUB? Get_CW_ Subscription_ Info_VLR CW available? Get_LI_ Subscription_ Info_MT_VLR Get_AoC_ Subscription_ Info_VLR 4 5 Process Access Request Process_ Access_ Request_VLR Result= Pass? CUG info present? Translate CUG interlock to index As defined in GSM 03.85 Success? CFNRy A&O? Provide NRCT value Get_LI_ Subscription_ Info_MT_VLR Get_AoC_ Subscription_ Info_VLR Complete Call Wait_For_ Complete_Call_ Result Set negative response: System failure Send Info For Incoming Call negative response Idle Idle Abort 2 3 Yes No No Yes No Yes No Yes Yes Yes Yes Yes No No No No Figure 68b: Process ICH_VLR (sheet 2) ETSI TS 101 043 V5.6.0 (1998-11) 139 GSM 03.18 version 5.6.0 Release 1996 Process in VLRB to handle a request for information for an incoming (MT) call Process ICH_VLR ICH_VLR3(6) Signals to/from the left are to/from the MSC. Wait_for_ Complete_Call Result Complete Call ack Idle Abort Complete Call negative response Busy subscriber? Absent subscriber? Radio congestion? No subscriber reply? Set negative response: Impossible call completion Send Info For Incoming Call negative response Idle 6 1 5 No No No No Yes Yes Yes Yes Figure 68c: Process ICH_VLR (sheet 3) ETSI TS 101 043 V5.6.0 (1998-11) 140 GSM 03.18 version 5.6.0 Release 1996 Process in VLRB to handle a request for information for an incoming (MT) call Process ICH_VLR ICH_VLR4(6) Signals to/from the left are to/from the MSC. 4 CFNRy A&O? Set NRCT Process Call Waiting Wait_For_ PCW_Result Process Call Waiting ack Idle Abort Process Call Waiting negative response Busy subscriber? No subscriber reply? Set negative response: Impossible call completion Send Info For Incoming Call negative response Idle 6 5 Yea No No Yes Yes No Figure 68d: Process ICH_VLR (sheet 4) ETSI TS 101 043 V5.6.0 (1998-11) 141 GSM 03.18 version 5.6.0 Release 1996 Process in VLRB to handle a request for information for an incoming (MT) call Process ICH_VLR ICH_VLR5(6) 1 Handle_CFNRc Result= Fail? Set negative response: Forwarding Violation Send Info For Incoming Call negative response Idle Result= Forward? Set negative response: Absent Subscriber 7 5 Handle_CFB Result= Fail? Set negative response: Forwarding Violation Result= Forward? Set negative response: Busy Subscriber 7 6 Handle_CFNRy Result= Fail? Set negative response: Forwarding Violation Result= Forward? Set negative response: No Subscriber Reply 7 Yes No No Yes Yes No No Yes Yes No No Yes Figure 68e: Process ICH_VLR (sheet 5) ETSI TS 101 043 V5.6.0 (1998-11) 142 GSM 03.18 version 5.6.0 Release 1996 Process in VLRB to handle a request for information for an incoming (MT) call Process ICH_VLR ICH_VLR6(6) Signals to the left are to the MSC. 7 Forward_ CUG_Check Result= Call allowed? Set result: Forward Set forwarding information Send Info For Incoming Call ack Idle Set negative response: CUG reject Send Info For Incoming Call negative response Idle Yes No Figure 68f: Process ICH_VLR (sheet 6) ETSI TS 101 043 V5.6.0 (1998-11) 143 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to derive the requested basic service for an incoming (MT) call Procedure Derive_Requested_Basic_Service_VLR DRBS_V1(1) Basic service included in Send Info For Incoming Call? Basic service:= BS received in SIFIC GSM BC received in Provide Roaming Number Basic service:= BS derived from GSM BC Basic service:= default Yes No Yes No Figure 69: Procedure Derive_Requested_Basic_Service_VLR ETSI TS 101 043 V5.6.0 (1998-11) 144 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to search for an MS (i.e. page in all location areas) Procedure Search_For_MS_VLR SRCH_V1(1) Signals to/from the left are to/from the MSC Search For MS Page type= Circuit-switched call Wait_For_ Search_Result Abort Result:= Aborted Search For MS negative response Result:= Fail Search For MS ack Update Location Area ID Result:= Pass Figure 70: Procedure Search_For_MS_VLR ETSI TS 101 043 V5.6.0 (1998-11) 145 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to retrieve subscription information for the Call Waiting service Procedure Get_CW_Subscription_Info_VLR CWI_VLR1(1) Signals to/from the right are to/from the process MAF013 initiate handling of CW Wait_For_ CW_Info Abort process call waiting From MSC Figure 71: Procedure Get_CW_Subscription_Info_VLR ETSI TS 101 043 V5.6.0 (1998-11) 146 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to retrieve subscription information for the CLIP & COLR line identification services for an MT call Procedure Get_LI_Subscription_Info_MT_VLR GLI_MTV1(1) Initiate handling of CLIP Wait_For_ CLIP_Info Abort Continue call handling Initiate handling of COLR Wait_For_ COLR_Info Abort Continue call handling From process COLR_MAF040 To process COLR_MAF040 From process CLIP_MAF001 To process CLIP_MAF001 From MSC From MSC Figure 72: Procedure Get_LI_Subscription_Info_MT_VLR ETSI TS 101 043 V5.6.0 (1998-11) 147 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to handle Call Forwarding on Busy Procedure Handle_CFB H_CFB1(1) Signals to/from the right are to/from the process MAF008 initiate handling of CFB Wait_For_ CFB_Result continue call handling Error? Normal call busy? Result:= Busy Result:= Forward Result:= Fail No Yes No Yes Figure 73: Procedure Handle_CFB ETSI TS 101 043 V5.6.0 (1998-11) 148 GSM 03.18 version 5.6.0 Release 1996 Procedure in the VLR to handle Call Forwarding on No subscriber Reply Procedure Handle_CFNRy H_CFNRy1(1) Signals to/from the right are to/from the process MAF009 initiate handling of CFNRy Wait_For_ CFNRy_Result continue call handling Error? Normal call? Result:= No reply Result:= Forward Result:= Fail No Yes No Yes Figure 74: Procedure Handle_CFNRy ETSI TS 101 043 V5.6.0 (1998-11) 149 GSM 03.18 version 5.6.0 Release 1996
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8 Contents of messages
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This clause specifies the content of each message shown in clauses 5 & 7, except for the following messages, which are not specific to call handling: On the D interface (VLR-HLR): - Abort; - Activate Trace Mode - Insert Subscriber Data - Send Authentication Info; - Send Authentication Info ack; - Send Authentication Info negative response; In the tables which follow, information elements are shown as mandatory (M), conditional (C) or optional (O). A mandatory information element shall always be present. A conditional information element shall be present if certain conditions are fulfilled; if those conditions are not fulfilled it shall be absent. An optional element may be present or absent, at the discretion of the application at the sending entity.
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1 Messages on the B interface (MSC-VLR)
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.1 Abort
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The following information element is required: Information element name Required Description Abort reason M Indicates the reason for the procedure being aborted.
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.2 Authenticate
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The following information elements are required: Information element name Required Description RAND M Random number challenge to be sent to the MS (ETS 300 534 [3]) CKSN M Cipher key sequence number to be sent to the MS (ETS 300 534 [3])
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.3 Authenticate ack
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The following information element is required: Information element name Required Description SRES M Signature result returned by the MS (ETS 300 534 [3])
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.4 Check IMEI
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This message contains no information elements.
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.5 Check IMEI ack
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The following information element is required: ETSI TS 101 043 V5.6.0 (1998-11) 150 GSM 03.18 version 5.6.0 Release 1996 Information element name Required Description Equipment status M Indicates whether the ME is black-listed, grey-listed or white-listed
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.6 Check IMEI negative response
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The negative response information element can take the following values: - System failure; - Unknown equipment.
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.7 Complete Call
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The following information elements are required: Information element name Required Description MSISDN C MSISDN of the MS for which the Complete Call is sent. Shall be present for an ordinary MO call, for an MT call and for an emergency call when the MS is registered in the VLR; otherwise shall be absent. IMEI C IMEI of the mobile for which the Complete Call is sent. Shall be present for an emergency call when the mobile is identified only by its IMEI; otherwise shall be absent. Category C Category of the MS for which the Complete Call is sent. Shall be present for an ordinary MO call and for an emergency call when the MS is registered in the VLR; otherwise shall be absent. GSM bearer capability C Shall be present for an MT call if it was received in the Provide Roaming Number; otherwise shall be absent. ISDN bearer capability C Shall be present for an MT call if it was received in the Provide Roaming Number; otherwise shall be absent. ISDN low layer compatibility C Shall be present for an MT call if it was received in the Provide Roaming Number; otherwise shall be absent. ISDN high layer compatibility C Shall be present for an MT call if it was received in the Provide Roaming Number; otherwise shall be absent. CLIP provision C Indicates that CLIP is provisioned. Shall be present for an MT call if CLIP is provisioned; otherwise shall be absent. CLIR override provision C Indicates that the CLIR override subscription option of CLIP is provisioned. Shall be present for an MT call if CLIP is provisioned with the CLIR override subscription option and the MS is registered in the HPLMN country; otherwise shall be absent. CLIR provision C Indicates that CLIR is provisioned. Shall be present for an MO call if CLIR is provisioned; otherwise shall be absent. CLIR mode C Indicates the mode in which CLIR is provisioned: permanent, temporary (default presentation allowed) or temporary (default presentation restricted). Shall be present for an MO call if CLIR is provisioned; otherwise shall be absent. COLP provision C Indicates that COLP is provisioned. Shall be present for an MO call if COLP is provisioned; otherwise shall be absent. COLR override provision C Indicates that the COLR override subscription option of COLP is provisioned. Shall be present for an MO call if COLP is provisioned with the COLR override subscription option and the MS is registered in the HPLMN country; otherwise shall be absent. COLR provision C Indicates that COLR is provisioned. Shall be present for an MT call if COLR is provisioned; otherwise shall be absent. No Reply Condition Timer C Value of timer to be used to determine the No subscriber reply condition. Shall be present for an MT call if the Call Forwarding on No Reply service is active and operative; otherwise shall be absent. CUG index C For the definition of this IE, see ETS 300 546 [11]. May be present (as a network operator option) for an ordinary MO call if the call is a CUG call; shall be present for an MT call if the call is a CUG call; otherwise shall be absent. (continued) ETSI TS 101 043 V5.6.0 (1998-11) 151 GSM 03.18 version 5.6.0 Release 1996 The following information elements are required (concluded): Information element name Required Description CUG interlock C For the definition of this IE, see ETS 300 546 [11]. Shall be present for an ordinary MO call if the call is a CUG call; otherwise shall be absent. CUG outgoing access C For the definition of this IE, see ETS 300 546 [11]. Shall be present for an ordinary MO call if the call is a CUG call with outgoing access; otherwise shall be absent. Advice of Charge provision C Indicates whether Advice of Charge (Information) or Advice of Charge (Charging) is provisioned. Shall be present for an ordinary MO call or an MT call if Advice of Charge is provisioned; otherwise shall be absent. Alerting Pattern C Shall be present for an MT call if it was received in the Provide Roaming Number and if the feature is supported by the MSC/VLR; otherwise shall be absent. NAEA preferred Carrier Id O The preferred carrier identity identifying the carrier to be used to route the interexchange call if the call requires routing via an interexchange carrier. This parameter may be included at the discretion of the VLR operator.
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.8 Complete Call ack
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This message contains no information elements.
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.9 Complete Call negative response
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The negative response information element can take the following values: - Absent subscriber; - Busy subscriber; - No subscriber reply; - Radio congestion.
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.10 Forward New TMSI
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The following information element is required: Information element name Required Description TMSI M TMSI to be sent to the MS.
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.11 Forward New TMSI ack
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This message contains no information elements.
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.12 Forward New TMSI negative response
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The negative response information element can take the following value: - TMSI reallocation failure. ETSI TS 101 043 V5.6.0 (1998-11) 152 GSM 03.18 version 5.6.0 Release 1996
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.13 Obtain Subscriber Info
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The following information elements are required: Information element name Required Description IMSI M IMSI of the MS for which information is required. Location information requested C Indicates that the VLR requires location information for the MS. Shall be present if location information is required; otherwise shall be absent. Subscriber state requested C Indicates that the VLR requires state information for the MS. Shall be present if state information is required; otherwise shall be absent.
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.14 Obtain Subscriber Info ack
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The following information elements are required: Information element name Required Description Cell global identity C Identity of the cell from which the MS established a radio transaction. Shall be present if the VLR requested location information and the mobile is currently engaged on a radio transaction; otherwise shall be absent. Age of location information C Time in minutes since the MS last established a radio transaction. Shall be present if the VLR requested location information; otherwise shall be absent. Subscriber state C Indicates whether the MS is busy (i.e. engaged on a circuit- switched call) or assumed idle. Shall be present if the VLR requested state information; otherwise shall be absent.
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.15 Page MS
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The following information elements are required: Information element name Required Description IMSI M IMSI of the MS to be paged. Location area ID M Location area in which the MS is to be paged. Page type M Indicates whether the paging is for a circuit-switched call, MT SMS delivery or SS activity TMSI O TMSI to be broadcast to identify the MS.
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.16 Page MS negative response
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The negative response information element can take the following values: - Absent subscriber; - Busy subscriber (More calls possible); - Busy subscriber (NDUB); - System failure; - Unknown location area ID. The Page MS negative response Busy subscriber (More calls possible) also indicates the basic service which applies for the established call. ETSI TS 101 043 V5.6.0 (1998-11) 153 GSM 03.18 version 5.6.0 Release 1996
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4adb5594a028990749bbb6b19a2cf30e
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101 043
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8.1.17 Process Access Request
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The following information elements are required: Information element name Required Description CM service type M Indicates the type of access required: normal MO call, emergency call or page response. Other values (short message service and SS request) defined for this IE are not considered in this specification. Access connection status M Indicates whether or not the connection to the MS is ciphered and whether or not it is authenticated. Current location area ID M Identity of the location area from which the access request was received. IMSI C IMSI of the MS requesting the access. For normal MO call or page response, one of IMSI or TMSI shall be present. For emergency call, one of IMSI, TMSI or IMEI shall be present. TMSI C TMSI of the MS requesting the access. For normal MO call or page response, one of IMSI or TMSI shall be present. For emergency call, one of IMSI, TMSI or IMEI shall be present. IMEI C IMEI of the MS requesting the access. For normal MO call or page response, one of IMSI or TMSI shall be present. For emergency call, one of IMSI, TMSI or IMEI shall be present. CKSN C Cipher key sequence number of the MS requesting the access. Shall be present if TMSI is present; otherwise shall be absent.
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4adb5594a028990749bbb6b19a2cf30e
|
101 043
|
8.1.18 Process Access Request ack
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The following information elements are required: Information element name Required Description IMSI C IMSI of the MS requesting the access. For normal MO call or page response, shall be present. For emergency call, one of IMSI or IMEI shall be present. IMEI C IMEI of the MS requesting the access. For normal MO call or page response, shall be absent. For emergency call, one of IMSI or IMEI shall be present. MSISDN O MSISDN of the MS requesting the access.
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