Content for TR 32.849 Word version: 13.0.0
2 References
3 Definitions, symbols and abbreviations
4 Overview
5 Description of Scenarios
6 Key Issues
7 Conclusions
$ Change History
2 References p. 7
3 Definitions, symbols and abbreviations p. 9
4 Overview p. 11
4.1 General p. 11
4.2 General Charging Concept p. 11
4.3 Inter Operator Identifier p. 11
4.3.1 Type of IOI's p. 11
4.3.2 Format of IOI's p. 13
4.3.3 Basic IMS roaming scenario without loopback p. 13
4.3.4 VPLMN routing IMS roaming scenario with loopback p. 15
4.3.5 Rules for Transit-IOI p. 18
4.4 Inter-level Charging Correlation p. 20
4.4.1 Definitions p. 20
4.4.2 Associating PS Domain Resources with an IMS Session p. 20
4.4.3 Associating IMS Session with PS Domain Charging p. 21
4.5 Identifying the II-NNI traversal scenario p. 21
4.6 Use of preconditions in IMS networks p. 22
5 Description of Scenarios p. 23
5.1 Methodology for Entities description p. 23
5.1.1 Naming of URIs p. 23
5.1.1.1 General p. 23
5.1.1.2 Home Network Domain p. 23
5.1.1.3 Private user identity p. 23
5.1.1.4 Public user identity p. 23
5.1.1.5 Instance-ID p. 23
5.1.2 Notation conventions p. 24
5.1.3 Network Entities p. 24
5.2 Registration when roaming p. 25
5.2.1 General p. 25
5.2.2 Registration via IC SIP proxies p. 25
5.2.3 Subscription to the registration-state event package p. 31
5.3 Mobile Originating Call without loopback p. 34
5.4 Mobile Originating Call with loopback p. 46
5.5 Routeing when the originating and terminating user reside in the same home network p. 59
5.6 Routeing from originating home to terminating home network p. 59
5.7 Routeing from originating visited network to terminating home network p. 59
5.8 Routeing in terminating home network when user resides in this network p. 60
5.9 Routeing from terminating home network to the terminating visited network p. 60
5.10 Insertion of service related media in the originating home network p. 69
5.11 PS to CS SRVCC access transfer scenarios p. 77
5.11.1 General p. 77
5.11.2 PS to CS SRVCC information transfer during registration p. 77
5.11.3 PS to CS SRVCC access transfer for a call in the active phase without loopback p. 81
5.11.4 PS to CS SRVCC access transfer for a call in the active phase with loopback p. 86
5.12 Invocation and configuration of services during roaming in a visited network p. 89
6 Key Issues p. 89
6.1 Key Issue #1: Unnecessary correlation of CDRs when loopback is not active p. 89
6.1.1 Description p. 89
6.1.2 Assumptions p. 90
6.1.3 Current Status p. 90
6.1.4 Alternative Options p. 90
6.1.5 Evaluation and Recommendation p. 90
6.2 Key Issue #2: Identification of home network p. 90
6.2.1 Description p. 90
6.2.2 Assumptions p. 91
6.2.3 Current Status p. 91
6.2.4 Alternative Options p. 92
6.2.4.1 Alternative 1 - Home Network Information from Registration Procedure p. 92
6.2.4.2 Alternative 2 - IOI sent in SIP INVITE Request and SIP 200 (OK) response p. 92
6.2.4.3 Alternative 3 - Use of other SIP header fields p. 92
6.2.5 Evaluation and Recommendation p. 93
6.3 Key Issue #3: Media Plane Interconnection is not reflected in any CDR p. 93
6.3.1 Description p. 93
6.3.2 Assumptions p. 94
6.3.3 Current Status p. 94
6.3.4 Alternative Options p. 94
6.3.5 Evaluation and Recommendation p. 95
6.4 Other topics to be considered and recommendations p. 96
7 Conclusions p. 97
$ Change History p. 98
