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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
IP Multimedia Subsystem (IMS) centralized services;
Stage 2
(3GPP TS 23.292 version 15.0.0 Release 15)
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3GPP TS 23.292 version 15.0.0 Release 15 1 ETSI TS 123 292 V15.0.0 (2018-07)
Reference
RTS/TSGS-0223292vf00
Keywords
GSM,LTE,UMTS
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ETSI
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3GPP TS 23.292 version 15.0.0 Release 15 2 ETSI TS 123 292 V15.0.0 (2018-07)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
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ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
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Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
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3GPP TS 23.292 version 15.0.0 Release 15 3 ETSI TS 123 292 V15.0.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 8
1 Scope . 9
2 References . 9
3 Definitions and abbreviations . 11
3.1 Definitions . 11
3.2 Abbreviations . 12
4 High level principles and requirements . 12
4.1 General . 12
4.2 Service consistency . 13
4.3 Service continuity . 13
4.4 Session scenarios . 13
4.4.1 Overview . 13
4.4.2 ICS UE Session Scenarios . 13
4.5 Service settings data management . 13
4.6 Identities . 14
4.6.1 Identities used by an ICS UE . 14
4.6.2 Identities used by an MSC Server enhanced for ICS . 14
4.7 Coexistence of an ICS UE and a non ICS UE . 14
4.8 Routing of originated calls to IMS . 14
4.9 Void . 14
5 Architecture model and reference points . 15
5.1 Overview . 15
5.2 Reference architecture . 15
5.3 Functional Entities . 15
5.3.1 SCC AS . 15
5.3.2 UE enhanced for ICS . 17
5.3.3 MSC Server enhancements for ICS . 18
5.3.4 Emergency CSCF (E-CSCF) . 18
5.4 Reference points . 19
5.4.1 Reference Point UE – SCC AS (I1) . 19
5.4.2 Reference Point MSC Server – CSCF (I2) . 19
5.4.3 Reference Point MSC server – CS-MGW (Mc) . 19
5.4.4 Reference Point MSC Server - TAS (I3) . 19
5.4.5 Reference Point MSC Server - E-CSCF (I6) . 19
6 Functional description . 19
6.1 Common IMS Functions . 19
6.1.1 P-CSCF procedures. 19
6.1.2 IMS ALG procedures. 19
6.1.3 S-CSCF procedures. 19
6.1.4 IBCF procedures . 19
7 Procedures and flows. 20
7.0 General . 20
7.1 Signalling and bearer paths . 20
7.1.1 Sessions established using the Gm or I1 reference point . 20
7.1.2 Sessions established using CS call control and MSC Server . 21
7.2 Registration . 22
7.2.1 IMS registration via CS access . 22
7.2.1.1 Overview . 22
7.2.1.2 Registration using I2 reference point . 23
ETSI
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3GPP TS 23.292 version 15.0.0 Release 15 4 ETSI TS 123 292 V15.0.0 (2018-07)
7.2.1.3 Deregistration using I2 reference point . 25
7.2.1.4 Registration after Deregistration using I2 reference point . 26
7.2.1.5 Registration before Deregistration using I2 reference point . 26
7.2.2 IMS Registration via IP-CAN . 27
7.3 Originations . 28
7.3.1 Originating sessions that use PS media. 28
7.3.2 Originating sessions that use CS media . 28
7.3.2.1 Non ICS UE originating sessions that use CS media . 28
7.3.2.1.1 Overview . 28
7.3.2.1.2 Origination using I2 reference point . 28
7.3.2.1.3 Origination when using an MSC Server . 29
7.3.2.2 ICS UE Originating sessions that use CS media . 31
7.3.2.2.1 Overview . 31
7.3.2.2.2 Originations with CS media when using I1 . 32
7.3.2.2.3 Originations with CS media when not using I1 . 37
7.3.2.2.4 Originations with CS media using the Gm reference point . 37
7.3.2.3 CS Emergency call interworking with IMS . 40
7.4 Terminations . 40
7.4.1 Terminating sessions that use PS media . 40
7.4.1.1 Full duplex speech via PS . 40
7.4.1.2 Void. 40
7.4.1.3 Void. 40
7.4.2 Terminating sessions that use CS media . 40
7.4.2.1 Non ICS UE terminating sessions that use CS media . 40
7.4.2.1.1 Overview . 40
7.4.2.1.2 Termination using I2 reference point . 41
7.4.2.1.3 Termination to non ICS UE not registered in IMS . 42
7.4.2.2 ICS UE Terminating sessions that use CS media . 44
7.4.2.2.1 Overview . 44
7.4.2.2.2 Terminations with CS media using the Gm reference point . 44
7.4.2.2.3 Terminations with CS media using the I1 reference point . 49
7.4.2.2.4 Terminations with CS media using CS control with I1 augmentation. 54
7.4.2.2.5 Terminations with CS media when not using Gm or I1 . 54
7.4.2.2.6 Void . 54
7.4.2.2.7 Terminating access network reselection – fallback to alternate access . 54
7.4.3 Terminating sessions over Gm rejected by the UE . 55
7.5 Service continuity . 57
7.5.1 Service continuity for ICS UE . 57
7.5.1.1 Service continuity while maintaining the use of CS access for the media . 57
7.5.1.1.1 IMS sessions established using Gm reference point . 57
7.5.1.2 Service continuity when transferring the media of IMS sessions between PS and CS access . 58
7.5a Addition of Gm service control to existing call. 58
7.5a.1 Overview . 58
7.5a.2 Augmentation call flow . 58
7.6 Consistency of Supplementary Services . 59
7.6.0 General . 59
7.6.1 Supplementary Services for ICS UE . 59
7.6.1.1 Overview . 59
7.6.1.2 IMS sessions using CS bearer . 59
7.6.1.2.1 Overview . 59
7.6.1.2.2 Use of Gm reference point. 60
7.6.1.2.3 Use of I1 reference point . 67
7.6.1.2.4 When use of Gm or I1 reference point is not possible due to VPLMN limitations . 76
7.6.1.3 User configuration of Supplementary Services . 77
7.6.2 Supplementary service invocation using the MSC Server enhanced for ICS . 77
7.6.2.1 Overview . 77
7.6.2.2 Line ID Services (OIP, OIR, TIP, TIR) . 77
7.6.2.3 Communication Diversion Services . 77
7.6.2.3.1 Communication Forwarding Unconditional (CFU) . 77
7.6.2.3.2 Communication Forwarding Busy (CFB) . 77
7.6.2.3.3 Communication Forwarding No Reply (CFNR) . 77
7.6.2.3.4 Communication Forwarding on Not Logged-in (CFNL) . 78
ETSI
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3GPP TS 23.292 version 15.0.0 Release 15 5 ETSI TS 123 292 V15.0.0 (2018-07)
7.6.2.3.5 Communication Deflection (CD) . 78
7.6.2.3.6 Communication Forwarding on Subscriber Not Reachable (CFNRc) . 78
7.6.2.3.7 Communication Diversion Notification (CDIVN) . 78
7.6.2.3.8 Diversion notifications to originating users . 78
7.6.2.4 Communication Barring . 78
7.6.2.5 Communication Hold/Resume . 78
7.6.2.6 Communication Waiting . 80
7.6.2.7 Explicit Communication Transfer . 81
7.6.2.8 Conferencing . 86
7.6.2.9 User configuration of communication service settings . 88
7.6.2.9.1 TAS procedures . 88
7.6.2.9.2 UE supporting multimedia telephony . 88
7.6.2.9.3 MSC Server enhanced for ICS . 88
7.6.2.10 Customized Alerting Tone (CAT) . 88
7.6.2.11 Communication Completion on Busy Subscriber/No Reply/Not Logged In . 88
7.6.2.11.1 Communication Completion Terminated at Served User . 88
7.6.2.11.2 Communication Completion Originated at Served User . 90
7.6.3 Service consistency for non ICS UE when attached to an MSC Server not enhanced with ICS . 91
7.6.3.1 Line ID Services (OIP, OIR, TIP, TIR) . 91
7.6.3.2 Communication Diversion Services . 91
7.6.3.2.1 Communication Diversion services; CFU, CFNL . 91
7.6.3.2.2 Communication Diversion services; CFNR, CFB . 91
7.6.3.2.2a Communication Diversion services; CFNRc . 91
7.6.3.2.3 Communication Diversion services; Communication Deflection . 91
7.6.3.3 Communication Barring . 91
7.6.3.4 Communication Hold/Resume . 91
7.6.3.5 Explicit Communication Transfer . 91
7.6.3.6 Conferencing . 92
7.6.3.7 User configuration of Supplementary Services . 92
7.6.3.7.1 UE not supporting multimedia telephony . 92
7.6.3.7.2 UE supporting multimedia telephony . 92
7.6.3.8 Customized Alerting Tone (CAT) . 92
7.6.3.9 Communication Waiting . 92
7.6.3.10 Communication Completion on Busy Subscriber/No Reply/Not Logged In . 92
7.6.3.10.1 Communication Completion Terminated at Served User . 92
7.6.3.10.2 Communication Completion Originated at Served User . 94
7.7 Session Release . 95
7.7.1 Session Release for ICS UE . 95
7.7.1.1 General Gm Procedures . 95
7.7.1.2 Session Release for Gm and I1 . 95
7.7.1.3 Release of the Service Control Signalling Session when using I1 . 96
7.7.1.3.1 ICS UE Initiated Release . 96
7.7.1.3.2 Network Initiated Release . 97
7.7.1.3.3 Far End Initiated Release . 98
7.7.2 Session Release for MSC Server enhanced for ICS . 99
7.7.2.1 General . 99
7.7.2.2 Session Release by served UE . 99
7.7.2.3 Session Release by far-end . 100
7.7.2.4 Network initiated Session Release . 100
7.8 Loss of Gm capability .
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