ETSI TS 124 229 V15.8.0 (2019-10)

TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
IP multimedia call control protocol based on
Session Initiation Protocol (SIP)
and Session Description Protocol (SDP);
Stage 3
(3GPP TS 24.229 version 15.8.0 Release 15)


3GPP TS 24.229 version 15.8.0 Release 15 1 ETSI TS 124 229 V15.8.0 (2019-10)

Reference
RTS/TSGC-0124229vf80
Keywords
GSM,LTE,UMTS
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© ETSI 2019.
All rights reserved.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
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GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
3GPP TS 24.229 version 15.8.0 Release 15 2 ETSI TS 124 229 V15.8.0 (2019-10)
Intellectual Property Rights
Essential patents
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pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
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Legal Notice
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. These shall be
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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
3GPP TS 24.229 version 15.8.0 Release 15 3 ETSI TS 124 229 V15.8.0 (2019-10)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 37
1 Scope . 38
2 References . 39
3 Definitions and abbreviations . 53
3.1 Definitions . 53
3.2 Abbreviations . 61
3A Interoperability with different IP-CAN . 64
4 General . 65
4.1 Conformance of IM CN subsystem entities to SIP, SDP and other protocols . 65
4.2 URI and address assignments . 68
4.2A Transport mechanisms . 70
4.2B Security mechanisms . 70
4.2B.1 Signalling security . 70
4.2B.2 Media security . 72
4.3 Routeing principles of IM CN subsystem entities . 75
4.4 Trust domain . 75
4.4.1 General . 75
4.4.2 P-Asserted-Identity . 76
4.4.3 P-Access-Network-Info . 76
4.4.4 History-Info . 77
4.4.5 P-Asserted-Service. 77
4.4.6 Resource-Priority . 77
4.4.7 Reason (in a response) . 77
4.4.8 P-Profile-Key . 77
4.4.9 P-Served-User . 77
4.4.10 P-Private-Network-Indication . 77
4.4.11 P-Early-Media . 78
4.4.12 CPC and OLI . 78
4.4.13 Feature-Caps . 78
4.4.14 Priority . 78
4.4.15 iotl . 78
4.4.16 Restoration-Info . 78
4.4.17 Relayed-Charge . 78
4.4.18 Service-Interact-Info . 78
4.4.19 Cellular-Network-Info . 79
4.4.20 Response-Source . 79
4.4.21 Attestation-Info header field . 79
4.4.22 Origination-Id header field . 79
4.5 Charging correlation principles for IM CN subsystems . 79
4.5.1 Overview . 79
4.5.2 IM CN subsystem charging identifier (ICID) . 80
4.5.2A Related ICID . 80
4.5.3 Access network charging information . 81
4.5.3.1 General . 81
4.5.3.2 Access network charging information . 81
4.5.4 Inter operator identifier (IOI) . 81
4.5.4A Transit inter operator identifier (Transit IOI) . 83
4.5.5 Charging function addresses . 84
4.5.6 Relayed charge parameters . 84
4.5.7 Loopback-indication parameter . 84
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4.5.8 IM CN subsystem Functional Entity Identifier . 84
4.5.8.1 General . 84
4.5.8.2 Tracking of IM CN subsystem functional entities generating charging information . 84
4.5.8.3 Tracking of applications generating charging information . 85
4.6 Support of local service numbers . 85
4.7 Emergency service . 85
4.7.1 Introduction. 85
4.7.2 Emergency calls generated by a UE . 85
4.7.3 Emergency calls generated by an AS . 86
4.7.4 Emergency calls received from an enterprise network . 86
4.7.5 Location in emergency calls . 86
4.7.6 eCall type of emergency service . 87
4.8 Tracing of signalling . 87
4.8.1 General . 87
4.8.2 Trace depth . 87
4.9 Overlap signalling . 88
4.9.1 General . 88
4.9.2 Overlap signalling methods . 88
4.9.2.1 In-dialog method . 88
4.9.2.1.1 General . 88
4.9.2.2 Multiple-INVITE method . 88
4.9.2.2.1 General . 88
4.9.3 Routeing impacts . 88
4.9.3.1 General . 88
4.9.3.2 Deterministic routeing . 88
4.9.3.3 Digit collection . 89
4.10 Dialog correlation for IM CN subsystems . 89
4.10.1 General . 89
4.10.2 CONF usage. 89
4.11 Priority mechanisms . 89
4.12 Overload control . 91
4.13 II-NNI traversal scenario . 91
4.13.1 General . 91
4.13.2 Identifying the II-NNI traversal scenario . 92
4.13.3 Security aspects . 92
4.14 Restoration procedures . 92
4.14.1 General . 92
4.14.2 P-CSCF restoration procedures . 93
4.14.3 S-CSCF restoration procedures . 93
4.15 Resource sharing . 93
4.16 Priority sharing . 94
4.17 3GPP PS data off . 94
4.18 Dynamic Service Interaction . 94
5 Application usage of SIP . 95
5.1 Procedures at the UE . 95
5.1.0 General . 95
5.1.1 Registration and authentication. 95
5.1.1.1 General . 95
5.1.1.1A Parameters contained in the ISIM . 96
5.1.1.1B Parameters provisioned to a UE without ISIM or USIM . 96
5.1.1.1B.1 Parameters provisioned in the IMC . 96
5.1.1.1B.2 Parameters when UE does not contain ISIM, USIM or IMC . 97
5.1.1.2 Initial registration . 97
5.1.1.2.1 General . 97
5.1.1.2.2 Initial registration using IMS AKA . 102
5.1.1.2.3 Initial registration using SIP digest without TLS . 103
5.1.1.2.4 Initial registration using SIP digest with TLS . 104
5.1.1.2.5 Initial registration using NASS-IMS bundled authentication . 104
5.1.1.2.6 Initial registration using GPRS-IMS-Bundled authentication . 105
5.1.1.3 Subscription to the registration-state event package . 105
5.1.1.3A Void. 106
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5.1.1.4 User-initiated reregistration and registration of an additional public user identity . 106
5.1.1.4.1 General . 106
5.1.1.4.2 IMS AKA as a security mechanism. 110
5.1.1.4.3 SIP digest without TLS as a security mechanism . 111
5.1.1.4.4 SIP digest with TLS as a security mechanism . 111
5.1.1.4.5 NASS-IMS bundled authentication as a security mechanism . 112
5.1.1.4.6 GPRS-IMS-Bundled authentication as a security mechanism . 112
5.1.1.5 Authentication . 112
5.1.1.5.1 IMS AKA - general . 112
5.1.1.5.2 Void . 114
5.1.1.5.3 IMS AKA abnormal cases . 114
5.1.1.5.4 SIP digest without TLS – general . 115
5.1.1.5.5 SIP digest without TLS – abnormal procedures . 115
5.1.1.5.6 SIP digest with TLS – general . 115
5.1.1.5.7 SIP digest with TLS – abnormal procedures . 116
5.1.1.5.8 NASS-IMS bundled authentication – general . 116
5.1.1.5.9 NASS-IMS bundled authentication – abnormal procedures . 116
5.1.1.5.10 GPRS-IMS-Bundled authentication – general . 116
5.1.1.5.11 GPRS-IMS-Bundled authentication – abnormal procedures . 116
5.1.1.5.12 Abnormal procedures for all security mechanisms . 116
5.1.1.5A Network-initiated re-authentication . 116
5.1.1.5B Change of IPv6 address due to privacy . 117
5.1.1.6 User-initiated deregistration . 117
5.1.1.6.1 General . 117
5.1.1.6.2 IMS AKA as a security mechanism. 120
5.1.1.6.3 SIP digest without TLS as a security mechanism . 120
5.1.1.6.4 SIP digest with TLS as a security mechanism . 121
5.1.1.6.5 NASS-IMS bundled authentication as a security mechanism . 121
5.1.1.6.6 GPRS-IMS-Bundled authentication as a security mechanism . 121
5.1.1.7 Network-initiated deregistration . 122
5.1.2 Subscription and notification . 123
5.1.2.1 Notification about multiple registered public user identities . 123
5.1.2.2 General SUBSCRIBE requirements . 123
5.1.2A Generic procedures applicable to all methods excluding the REGISTER method . 123
5.1.2A.1 UE-originating case . 123
5.1.2A.1.1 General . 123
5.1.2A.1.2 Structure of Request-URI . 129
5.1.2A.1.3 UE without dial string processing capabilities . 129
5.1.2A.1.4 UE with dial string processing capabilities. 130
5.1.2A.1.5 Setting the "phone-context" tel URI parameter . 130
5.1.2A.1.5A Policy on local numbers . 131
5.1.2A.1.6 Abnormal cases . 132
5.1.2A.2 UE-terminating case . 134
5.1.3 Call initiation - UE-originating case . 136
5.1.3.1 Initial INVITE request . 136
5.1.4 Call initiation - UE-terminating case . 139
5.1.4.1 Initial INVITE request . 139
5.1.4.2 Reliable 18x Policy . 141
5.1.4A Session modification . 142
5.1.4A.0 General . 142
5.1.4A.1 Generating session modification request . 142
5.1.4A.2 Receiving session modification request . 142
5.1.5 Call release. 143
5.1.5A Precondition disabling policy . 143
5.1.6 Emergency service . 143
5.1.6.1 General . 143
5.1.6.2 Initial emergency registration. 145
5.1.6.2A New initial emergency registration . 145
5.1.6.3 Initial subscription to the registration-state event package . 146
5.1.6.4 User-initiated emergency reregistration . 146
5.1.6.5 Authentication . 146
5.1.6.6 User-initiated emergency deregistration . 146
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5.1.6.7 Network-initiated emergency deregistration . 146
5.1.6.8 Emergency session setup . 146
5.1.6.8.1 General . 146
5.1.6.8.2 Emergency session set-up in case of no registration . 147
5.1.6.8.3 Emergency session set-up within an emergency registration . 149
5.1.6.8.4 Emergency session setup within a non-emergency registration . 151
5.1.6.9 Emergency session release . 153
5.1.6.10 Successful or provisional response to a request not detected by the UE as relating to an
emergency session . 153
5.1.6.11 eCall type of emergency service . 154
5.1.6.11.1 General . 154
5.1.6.11.2 Initial INVITE request . 154
5.1.6.11.3 Transfer of an updated MSD . 155
5.1.6.12 Current location discovery during an emergency call . 156
5.1.6.12.1 General . 156
5.1.6.12.2 Current location information requested . 156
5.1.6.12.3 Providing current location information . 156
5.1.7 Void . 157
5.1.8 Void . 157
5.1.9 P-CSCF addresses management . 157
5.2 Procedures at the P-CSCF . 157
5.2.1 General . 157
5.2.2 Registration . 162
5.2.2.1 General . 162
5.2.2.2 IMS AKA as a security mechanism . 167
5.2.2.3 SIP digest without TLS as a security mechanism . 171
5.2.2.4 SIP digest with TLS as a security mechanism. 172
5.2.2.5 NASS-IMS bundled authentication as a security mechanism . 174
5.2.2.6 GPRS-IMS-Bundled authentication as a security mechanism . 174
5.2.2.7 P-CSCF reconfigured to not accept registrations . 175
5.2.3 Subscription to the user's registration-state event package . 175
5.2.3A Void . 176
5.2.3B SUBSCRIBE request . 176
5.2.4 Registration of multiple public user identities . 176
5.2.5 Deregistration . 178
5.2.5.1 User-initiated deregistration . 178
5.2.5.2 Network-initiated deregistration . 179
5.2.6 General treatment for all dialogs and standalone transactions excluding the REGISTER method . 179
5.2.6.1 Introduction . 179
5.2.6.2 Determination of UE-originated or UE-terminated case . 179
5.2.6.3 Requests initiated by the UE . 180
5.2.6.3.1 General for all requests . 180
5.2.6.3.2 General for all responses . 182
5.2.6.3.2A Abnormal cases . 182
5.2.6.3.3 Initial request for a dialog . 183
5.2.6.3.4 Responses to an initial request for a dialog . 185
5.2.6.3.5 Target refresh request for a dialog . 186
5.2.6.3.6 Responses to a target refresh request for a dialog . 186
5.2.6.3.7 Request for a standalone transaction . 187
5.2.6.3.8 Responses to a request for a standalone transaction . 188
5.2.6.3.9 Subsequent request other than a target refresh request . 189
5.2.6.3.10 Responses to a subsequent request other than a target refresh request . 189
5.2.6.3.11 Request for an unknown method that does not relate to an existing dialog . 189
5.2.6.3.12 Responses to a request for an unknown method that does not relate to an existing dialog . 191
5.2.6.4 Requests terminated by the UE . 191
5.2.6.4.1 General for all requests . 191
5.2.6.4.2 General for all responses . 192
5.2.6.4.3 Initial request for a dialog . 192
5.2.6.4.4 Responses to an initial request for a dialog . 193
5.2.6.4.5 Target refresh request for a dialog . 195
5.2.6.4.6 Responses to a target refresh request for a dialog . 195
5.2.6.4.7 Request for a standalone transaction . 196
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5.2.6.4.8 Responses to a request for a standalone transaction . 197
5.2.6.4.9 Subsequent request other than a target refresh request . 198
5.2.6.4.10 Responses to a subsequent request other than a target refresh request . 198
5.2.6.4.11 Request for an unknown method that does not relate to an existing dialog . 199
5.2.6.4.12 Responses to a request for an unknown method that does not relate to an existing dialog . 199
5.2.7 Initial INVITE . 199
5.2.7.1 Introduction . 199
5.2.7.2 UE-originating case . 199
5.2.7.3 UE-terminating case . 201
5.2.7.4 Access network charging information . 201
5.2.8 Call release. 201
5.2.8.1 P-CSCF-initiated call release . 201
5.2.8.1.1 Cancellation of a session currently being established. 201
5.2.8.1.2 Release of an existing session . 202
5.2.8.1.3 Abnormal cases . 204
5.2.8.1.4 Release of the existing dialogs due to registration expiration and deletion of the security
association, IP association or TLS session . 204
5.2.8.2 Call release initiated by any other entity . 205
5.2.8.3 Session expiration . 205
5.2.9 Subsequent requests .
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