Content for TR 29.949 Word version: 18.0.0
2 References p. 6
3 Definitions and abbreviations p. 7
3.1 Definitions p. 7
3.2 Abbreviations p. 9
4 Overview p. 10
4.1 General p. 10
4.2 3GPP specifications relevant for roaming architecture and procedures p. 10
4.3 Consideration of SIP header fields and elements p. 11
4.3.1 Inter Operator Identifier p. 11
4.3.1.1 Type of IOI's p. 11
4.3.1.2 Format of IOI's p. 12
4.3.1.3 Basic IMS roaming scenario without loopback p. 12
4.3.1.4 Originating visited network with loopback routeing scenario p. 13
4.3.1.5 Rules for transit-ioi p. 14
4.3.2 Naming of URIs p. 16
4.3.2.1 General p. 16
4.3.2.2 Home Network Domain p. 16
4.3.2.3 Private user identity p. 16
4.3.2.4 Public user identity p. 16
4.3.2.5 Instance-ID p. 17
4.4 Identifying the II-NNI traversal scenario p. 17
4.5 Use of preconditions in IMS networks p. 17
4.6 Loopback-indication header field parameter p. 17
5 Description of Scenarios p. 18
5.1 General p. 18
5.1.1 Methodology p. 18
5.1.1.1 Key required to interpret signalling flow in message coding examples p. 18
5.1.1.2 Functional entities covered in example flows p. 19
5.1.1.3 Notation conventions p. 19
5.1.1.3.1 Introduction p. 19
5.1.1.3.2 Public user Identities, public service identities and IP addresses p. 20
5.1.1.3.3 Network Entities p. 20
5.1.1.4 IOI values p. 21
5.2 Registration when roaming p. 21
5.2.1 General p. 21
5.2.2 Registration via IC SIP proxies p. 22
5.2.3 Subscription to the registration-state event package p. 29
5.3 Originating roaming without loopback p. 44
5.3.1 General p. 44
5.3.2 Call flow p. 44
5.4 Originating roaming with loopback p. 53
5.4.1 General p. 53
5.4.2 Call flow p. 53
5.5 Routeing when the originating and terminating user reside in the same home network p. 72
5.6 Routeing from originating home to terminating home network p. 72
5.7 Routeing from originating visited network to terminating home network p. 73
5.8 Routeing in terminating home network when user resides in this network p. 73
5.9 Routeing from terminating home network to the terminating visited network p. 73
5.10 Insertion of service related media in the originating home network p. 81
5.10.1 General p. 81
5.10.2 Insertion of service related media in the originating home network with loopback p. 82
5.10.3 Insertion of service related media in the originating home network without loopback p. 85
5.11 PS to CS SRVCC access transfer scenarios p. 87
5.11.1 General p. 87
5.11.2 PS to CS SRVCC information transfer during registration p. 87
5.11.3 PS to CS SRVCC access transfer for a call in the active phase without loopback p. 95
5.11.4 PS to CS SRVCC access transfer for a call in the active phase with loopback p. 103
5.12 Invocation and configuration of services during roaming in a visited network p. 105
$ Change History p. 106
