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TS 23.205
BICC — Bearer-Independent Circuit-Switched Core Network

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V19.0.0 (PDF)  2025/09  280 p.
V18.0.0  2024/03  280 p.
V17.0.0  2022/03  280 p.
V16.0.0  2020/06  279 p.
V15.0.0  2018/06  274 p.
V14.0.0  2017/03  275 p.
V13.0.0  2015/12  273 p.
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Rapporteur:
Mrs. Biondic, Nevenka
Ericsson LM
3GPP 23.205 - Bearer-Independent Circuit-Switched Core Network

essential Table of Contents for  TS 23.205  Word version:  19.0.0

each title links to the equivalent title in the CONTENT
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List of Figures and Tables

Figure 1CS core network logical architecture
Figure 6.1Basic Mobile Originating Call, Forward Bearer Establishment (network model)
Figure 6.2Basic Mobile Originating Call, Forward Bearer Establishment (message sequence chart)
Figure 6.2-2Basic Mobile Originating Call, Forward Bearer Establishment (message sequence chart continue)
Figure 6.3Basic Mobile Originating Call, Backward Bearer Establishment (network model)
Figure 6.4Basic Mobile Originating Call, Backward Bearer Establishment (message sequence chart)
Figure 6.4-2Basic Mobile Originating Call, Backward Bearer Establishment (message sequence chart continue)
Figure 6.1.3-1Call Establishment for Iu on IP
Figure 6.1.4.1Basic Mobile Originating Call, Forward Bearer Establishment with Trace Session Activation (network model)
Figure 6.1.4.2Basic Mobile Originating Call, Forward Bearer Establishment with Trace Session Activation (message sequence chart)
Figure 6.1.4.2-2Basic Mobile Originating Call, Forward Bearer Establishment with Trace Session Activation (message sequence chart continue)
Figure 6.1.5.1Originating Call Establishment for AoIP
Figure 6.5Basic Mobile Terminating Call Forward Bearer Establishment (network model)
Figure 6.6Basic Mobile Terminating Call, Forward Bearer Establishment (message sequence chart)
Figure 6.6-2Basic Mobile Terminating Call, Forward Bearer Establishment (message sequence chart continue)
Figure 6.7Basic Mobile Terminating Call, Backward Bearer Establishment (network model)
Figure 6.8Basic Mobile Terminating Call, Backward Bearer Establishment (message sequence chart)
Figure 6.8-2Basic Mobile Terminating Call, Backward Bearer Establishment (message sequence chart continue)
Figure 6.2.3-1Terminating Call Establishment For Iu Interface on IP
Figure 6.2.4-1Terminating Call Establishment For AoIP
Figure 7.1Network Initiated Call Clearing (Network model)
Figure 7.2Network Initiated Call Clearing (message sequence chart)
Figure 7.3User Initiated Call Clearing (Network model)
Figure 7.4User Initiated Call Clearing (message sequence chart)
Figure 7.5MSC Server Initiated Call Clearing (Network model)
Figure 7.6MSC Server Initiated Call Clearing (message sequence chart)
Figure 7.7MGW Initiated Call Clearing (Network model)
Figure 7.8MGW Initiated Call Clearing (message sequence chart)
Figure 7.9Network Initiated Call Clearing (Network model)
Figure 7.10Network Initiated Call Clearing (message sequence chart)
Figure 8.1Intra-MSC SRNS Relocation (network model)
Figure 8.2Intra-MSC SRNS Relocation (message sequence chart)
Figure 8.2-2Intra-MSC SRNS Relocation (message sequence chart)
Figure 8.3Basic Inter-MSC SRNS Relocation (network model)
Figure 8.4Basic Inter-MSC SRNS Relocation (message sequence chart)
Figure 8.4-2Basic Inter-MSC SRNS Relocation (message sequence chart)
Figure 8.5Subsequent Inter-MSC SRNS Relocation back to the Anchor MSC (network model)
Figure 8.6Subsequent Inter-MSC SRNS Relocation back to the Anchor MSC (message sequence chart)
Figure 8.6-2Subsequent Inter-MSC SRNS Relocation back to the Anchor MSC (message sequence chart)
Figure 8.1.5-1SRNS Relocation with Iu on IP
Figure 8.1.6-1Intra-MSC Enhanced SRNS Relocation (network model)
Figure 8.1.6-2Intra-MSC Enhanced SRNS Relocation (message sequence chart)
Figure 8.1.7-1Enhanced SRNS Relocation with Iu on IP
Figure 8.7Intra-MSC UMTS to GSM Handover (network model)
Figure 8.8Intra-MSC UMTS to GSM Handover (message sequence chart)
Figure 8.8-2Intra-MSC UMTS to GSM Handover (message sequence chart)
Figure 8.2.1.10-1Intra-MSC UMTS to GSM Handover for AoIP (message sequence chart)
Figure 8.9Basic Inter-MSC UMTS to GSM Handover (network model)
Figure 8.10Basic Inter-MSC UMTS to GSM Handover (message sequence chart)
Figure 8.10-2Basic Inter-MSC UMTS to GSM Handover (message sequence chart)
Figure 8.2.2.3-1Basic Inter-MSC UMTS to GSM Handover for AoIP (message sequence chart)
Figure 8.11Subsequent Inter-MSC UMTS to GSM Handover back to the Anchor MSC (network model)
Figure 8.12Subsequent Inter-MSC UMTS to GSM Handover back to the Anchor MSC (message sequence chart)
Figure 8.12-2Subsequent Inter-MSC UMTS to GSM Handover back to the Anchor MSC (message sequence chart)
Figure 8.2.3.3-1Subsequent Inter-MSC UMTS to GSM Handover back to the anchor MSC for AoIP (message sequence chart)
Figure 8.13Intra-3G_MSC GSM to UMTS Handover (network model)
Figure 8.14Intra-3G_MSC GSM to UMTS Handover (message sequence chart)
Figure 8.15Basic Inter-MSC GSM to UMTS Handover (network model)
Figure 8.16Basic Inter-MSC GSM to UMTS Handover (message sequence chart)
Figure 8.16-2Basic Inter-MSC GSM to UMTS Handover (message sequence chart)
Figure 8.17Subsequent Inter-MSC GSM to UMTS Handover back to the Anchor MSC (network model)
Figure 8.18Subsequent Inter-MSC GSM to UMTS Handover back to the Anchor MSC (message sequence chart)
Figure 8.18-2Subsequent Inter-MSC GSM to UMTS Handover back to the Anchor MSC (message sequence chart)
Figure 8.3.5-1GSM to UMTS Handover with Iu on IP
Figure 8.19Intra-MSC GSM to GSM Handover (network model)
Figure 8.20Intra-MSC GSM to GSM Handover (message sequence chart)
Figure 8.20-2Intra-MSC GSM to GSM Handover (message sequence chart)
Figure 8.4.1.9-1Intra-MSC GSM to GSM Handover for AoIP (message sequence chart)
Figure 8.21Basic Inter-MSC GSM to GSM Handover (network model)
Figure 8.22Basic Inter-MSC GSM to GSM Handover (message sequence chart)
Figure 8.22-2Basic Inter-MSC GSM to GSM Handover (message sequence chart)
Figure 8.4.2.3-1Basic Inter-MSC GSM to GSM Handover for AoIP (message sequence chart)
Figure 8.23Subsequent Inter-MSC GSM to GSM Handover back to the Anchor MSC (network model)
Figure 8.24Subsequent Inter-MSC GSM to GSM Handover back to the Anchor MSC (message sequence chart)
Figure 8.24-2Subsequent Inter-MSC GSM to GSM Handover back to the Anchor MSC (message sequence chart)
Figure 8.4.3.3-1Subsequent Inter-MSC GSM to GSM Handover back to the anchor MSC for AoIP (message sequence chart)
Figure 8.4.5.8.1Intra-MSC BSS Internal Handover (network model)
Figure 8.4.5.8.2Intra-MSC BSS Internal Handover for AoIP (message sequence chart)
Figure 9.1TDM circuits used for A-interface (network model)
Figure 10.1Signalling connection failure
Figure 10.2MGW indicates the Failure/Maintenance locking
Figure 10.3Communication goes up
Figure 10.4MGW indicates recovery from a failure/or maintenance unlocking
Figure 10.5-1MGW Restoration
Figure 10.5-2MGW Registration
Figure 10.6(G)MSC Server Restoration
Figure 10.7Re-registration of an MGW
Figure 10.8Re-registration ordered by the (G)MSC server
Figure 10.9Removal from service of a Physical Termination
Figure 10.10Restoration to service of a Physical Termination
Figure 10.11Audit Value
Figure 10.12Audit Capability
Figure 10.13Capability Update
Figure 10.14(G)MSC Server Out of Service
Figure 10.15MGW Resource Congestion Handling - Activate
Figure 10.17MGW Resource Congestion Handling - Indication
Figure 10.15.1Inactivity Timeout - Activate
Figure 10.15.2Inactivity Timeout - Indication
Figure 10.16.1Termination heartbeat - Indication
Figure 13.1Call deflection (Network model)
Figure 13.2Call deflection (message sequence chart)
Figure 13.3CFU (Network model)
Figure 13.4CFU (message sequence chart)
Figure 13.5CFB; NDUB (Network model)
Figure 13.6CFB (NDUB)
Figure 13.7CFB; UDUB (Network model)
Figure 13.8CFB (UDUB)
Figure 13.9CFNRy (Network model)
Figure 13.10CFNRy (message sequence chart)
Figure 13.11CFNRc; Rerouting by VLR (Network model)
Figure 13.12CFNRc (Rerouting by VLR) (message sequence chart)
Figure 13.13Call Wait (network model)
Figure 13.14Call Confirmation of the Waiting Call
Figure 13.15Acceptance of the Waiting Call
Figure 13.16Call hold and establishment of a new call (Network model) example 1
Figure 13.17Hold request (message sequence chart), example 1
Figure 13.18Retrieval request (message sequence chart), example 1
Figure 13.18aCall hold and establishment of a new call (Network model) example 2
Figure 13.18bHold request (message sequence chart), example 2
Figure 13.18cRetrieval request (message sequence chart), example 2
Figure 13.19Multi Party call (Network model)
Figure 13.20Information flow for multi party call, internal ATM bearer (message sequence chart)
Figure 13.20aInformation flow for multi party call, internal IP bearer (message sequence chart)
Figure 13.20bPrivate call (Network model)
Figure 13.20cInformation flow for private call (message sequence chart)
Figure 13.23ECT (Network model)
Figure 13.24Explicit call transfer; both calls answered (message sequence chart)
Figure 13.25Explicit call transfer; other call delivered (message sequence chart)
Figure 13.26Network initiated mobile originating call establishment with assignment after A and B party alerting (message sequence chart)
Figure 13.19-1GSM access Channel Mode Modify message
Figure 13.20.5-1VGCS call (termination overview for talker on dedicated channel)
Figure 13.20.5-2Talker on dedicated channel (Message sequence chart)
Figure 13.20.5-3VGCS call (termination overview for Talker on one channel model)
Figure 13.20.5-4Talker on one channel mode (Message sequence chart)
Figure 13.20.5-5Information flow talker move to uplink (Message sequence chart)
Figure 13.20.6-1Message sequence chart for a voice group call with AoIP when talker is on dedicated channel
Figure 14.1CAMEL Announcement Playing (message sequence chart)
Figure 14.2CAMEL User Interaction (message sequence chart)
Figure 14.1.3-1Initiate Call Attempt procedure (Network model)
Figure 14.1.3-2Information flow for Initiate Call Attempt (message sequence chart)
Figure 14.1.3-3Move Leg procedure (Network model)
Figure 14.1.3-4Information flow for Move Leg (message sequence chart)
Figure 14.1.3-5Split Leg procedure (Network model)
Figure 14.1.3-6Information flow for Split Leg (message sequence chart)
Figure 14.3Inband DTMF generation (message sequence chart)
Figure 14.4Out-of-Band DTMF generation (message sequence chart)
Figure 14.5Inband DTMF detection (message sequence chart)
Figure 14.6Out-of-Band DTMF detection (message sequence chart)
Figure 14.7Optimal routeing; late call forwarding (CFB (NDUB), CFNRc) (Network model)
Figure 14.8Information flow for optimal routeing; late call forwarding (CFB (NDUB), CFNRc) (message sequence chart)
Figure 14.9Optimal routeing; late call forwarding (CFB (UDUB), CFNRy, CD) (Network model)
Figure 14.10Information flow for optimal call routeing; late call forwarding (CFB (UDUB), CFNRy, CD), forward bearer release (message sequence chart)
Figure 14.11Optimal call routeing; late call forwarding (CFB (UDUB), CFNRy, CD), backward bearer release (message sequence chart)
Figure 14.12Providing in-band information (Network model)
Figure 14.13Playing an announcement/tone (message sequence chart)
Figure 14.6.8-1Proving in-band information (Network model)
Figure 14.6.8-2Playing an announcement/tone (message sequence chart)
Figure 14.10.3.3.3.1Multimedia CAT during a multimedia mobile originated call (message sequence chart)
Figure 15.1Forward Tunnelling Transport Mechanism (network model)
Figure 15.2Fast Forward Tunnelling Transport Mechanism (message sequence chart)
Figure 15.3Delayed Backward Tunnelling Transport Mechanism (network model)
Figure 15.4Delayed Backward Tunnelling Transport Mechanism (message sequence chart)
Table 16.1Messages between (G)MSC servers
Table 16.2Procedures between (G)MSC server and MGW: Change Flow Direction
Table 16.3Procedures between (G)MSC server and MGW: Join Bearer Termination
Table 16.4Procedures between (G)MSC server and MGW: Isolate Bearer Termination
Table 16.5Procedures between (G)MSC server and MGW: Establish Bearer
Table 16.6Procedures between (G)MSC server and MGW: Prepare Bearer
Table 16.7Procedures between (G)MSC server and MGW: Reserve Circuit
Table 16.8Procedures between (G)MSC server and MGW: Change Through-Connection
Table 16.9Procedures between (G)MSC server and MGW: Activate Interworking Function
Table 16.10Procedures between (G)MSC server and MGW: Release Bearer
Table 16.11Procedures between (G)MSC server and MGW: Bearer Established
Table 16.12Procedures between (G)MSC server and MGW: Bearer Released
Table 16.13Procedures between (G)MSC server and MGW: Release Termination
Table 16.14Procedures between (G)MSC server and MGW: Tunnel Information Up
Table 16.15Procedures between (G)MSC server and MGW: Tunnel Information
Table 16.16Procedures between (G)MSC server and MGW: Send Tone
Table 16.17Procedures between (G)MSC server and MGW: Stop Tone
Table 16.18Procedures between (G)MSC server and MGW: Play Announcement
Table 16.19Procedures between (G)MSC server and MGW: Stop Announcement
Table 16.20Procedures between (G)MSC server and MGW: Announcement Completed
Table 16.21Procedures between (G)MSC server and MGW: Tone Completed
Table 16.22Procedures between (G)MSC server and MGW: Detect DTMF
Table 16.23Procedures between (G)MSC server and MGW: Stop DTMF Detection
Table 16.24Procedures between (G)MSC server and MGW: Report DTMF
Table 16.25Procedures between (G)MSC server and MGW: Send DTMF
Table 16.26Procedures between (G)MSC server and MGW: Stop DTMF
Table 16.27Procedures between (G)MSC server and MGW: MGW Out-of-Service or Maintenance Locked
Table 16.28Procedures between (G)MSC server and MGW: MGW Communication Up
Table 16.29Procedures between (G)MSC server and MGW: MGW Restoration
Table 16.30Procedures between (G)MSC server and MGW: MGW Register
Table 16.31Procedures between (G)MSC server and MGW: MGW Re-register
Table 16.32Procedures between (G)MSC server and MGW: (G)MSC Server Ordered Re-register
Table 16.33Procedures between (G)MSC server and MGW: (G)MSC Server Restoration
Table 16.34Procedures between (G)MSC server and MGW: (G)MSC Server Out of Service
Table 16.35Procedures between (G)MSC server and MGW: Termination Out-of-Service
Table 16.36Procedures between (G)MSC server and MGW: Termination Restoration
Table 16.37Procedures between (G)MSC server and MGW: Audit Value
Table 16.38Procedures between (G)MSC server and MGW: Audit Capability
Table 16.39Procedures between (G)MSC server and MGW: Capability Update
Table 16.40Procedures between (G)MSC server and MGW: Command Reject
Table 16.41Procedures between (G)MSC server and MGW: Activate Voice Processing Function
Table 16.42Procedures between (G)MSC server and MGW: Modify Bearer Characteristics
Table 16.43Procedures between MSC server and MGW: Protocol Negotiation Result
Table 16.44Procedures between (G)MSC server and MGW: MGW Resource Congestion Handling - Activate
Table 16.45Procedures between (G)MSC server and MGW: MGW Resource Congestion Handling - Indication
Table 16.46Procedures between (G)MSC server and MGW: Bearer Modification
Table 16.47Procedures between (G)MSC server and MGW: CTM report
Table 16.48Procedures between (G)MSC server and MGW: Prepare_IP_Transport
Table 16.49Procedures between (G)MSC server and MGW: RNC IP address notification
Table 16.50Procedures between (G)MSC server and MGW: Emergency Call Indication
Table 16.51Procedures between (G)MSC server and MGW: Trace Activation
Table 16.52Procedures between (G)MSC server and MGW: Trace Deactivation
Table 16.53Procedures between MGW and (G)MSC Server: Trace Activation result notification
Table 16.54Continuity Check Tone procedure
Table 16.55Continuity Check Verify procedure
Table 16.56Continuity Check Response procedure
Table 16.57Procedures between (G)MSC server and MGW: Rate Change
Table 16.2.57-1Procedures between (G)MSC server and MGW: Bearer Modified
Table 16.2.58-1Procedures between (G)MSC server and MGW: Bearer Modification failed
Table 16.2.59-1Procedures between (G)MSC server and MGW: Hanging termination indication
Table 16.2.60-1Procedures between (G)MSC server and MGW: Inactivity timeout activation
Table 16.2.61-1Procedures between (G)MSC server and MGW: Inactivity timeout indication
Table 16.2.62.1Reserve RTP Connection Point
Table 16.2.63.1Configure RTP Connection Point Procedure
Table 16.2.64.1Reserve and Configure RTP Connection Point
Table 16.2.65.1Realm Availability Change - Activation
Table 16.2.66.1Realm Availability Change - Indication
Table 16.2.67.1Media Inactivity Notification
Figure 17.1ABefore CFNRy (Network model)
Figure 17.1BCFNRy and Bearer Redirect (Network model)
Figure 17.2Information flow for CFNRy with Bearer Redirect (message sequence chart)
Figure 18.1AMSC before MGW Tandeming during call setup to provide bearer access to specialised MGW resources (Network model)
Figure 18.1BMSC after MGW Tandeming during call setup to provide bearer access to specialised MGW resources (Network model)
Figure 18.2MSC MGW Tandeming during call setup to provide bearer access to specialised MGW resources (message sequence chart)
Table 19.1Timers for bearer independent CS core network
Figure 20-1Multiple IP realms scenario for Iu or Nb interface

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