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TR 32.849
Study on Charging aspects of
Roaming End-to-End Scenarios
with VoLTE IMS and Interconnecting Networks

3GPP‑Page  
V13.0.0 (Wzip)  2015/06  98 p.
Rapporteur:
Mr. Jesske, Roland
Deutsche Telekom AG

full Table of Contents for  TR 32.849  Word version:  13.0.0

1Scope  p. 7
2References  p. 7
3Definitions, symbols and abbreviations  p. 9
3.1Definitions  p. 9
3.2Symbols  p. 10
3.3Abbreviations  p. 10
4Overview  p. 11
4.1General  p. 11
4.2General Charging Concept  p. 11
4.3Inter Operator Identifier  p. 11
4.3.1Type of IOI's  p. 11
4.3.2Format of IOI's  p. 13
4.3.3Basic IMS roaming scenario without loopback  p. 13
4.3.4VPLMN routing IMS roaming scenario with loopback  p. 15
4.3.5Rules for Transit-IOI  p. 18
4.4Inter-level Charging Correlation  p. 20
4.4.1Definitions  p. 20
4.4.2Associating PS Domain Resources with an IMS Session  p. 20
4.4.3Associating IMS Session with PS Domain Charging  p. 21
4.5Identifying the II-NNI traversal scenario  p. 21
4.6Use of preconditions in IMS networks  p. 22
5Description of Scenarios  p. 23
5.1Methodology for Entities description  p. 23
5.1.1Naming of URIs  p. 23
5.1.1.1General  p. 23
5.1.1.2Home Network Domain  p. 23
5.1.1.3Private user identity  p. 23
5.1.1.4Public user identity  p. 23
5.1.1.5Instance-ID  p. 23
5.1.2Notation conventions  p. 24
5.1.2.1Introduction  p. 24
5.1.2.2User Identities and IP addresses  p. 24
5.1.3Network Entities  p. 24
5.1.3.1Served user UE-A's associated entities  p. 24
5.1.3.2Remote user's associated entities  p. 25
5.1.3.3Interconnection networks associated entities  p. 25
5.1.3.4IOI values  p. 25
5.2Registration when roaming  p. 25
5.2.1General  p. 25
5.2.2Registration via IC SIP proxies  p. 25
5.2.3Subscription to the registration-state event package  p. 31
5.2.3.1General  p. 31
5.2.3.2The UE subscribes to the registration-state event package  p. 31
5.2.3.3The P-CSCF subscribes to the registration-state event package  p. 32
5.3Mobile Originating Call without loopback  p. 34
5.4Mobile Originating Call with loopback  p. 46
5.5Routeing when the originating and terminating user reside in the same home network  p. 59
5.6Routeing from originating home to terminating home network  p. 59
5.7Routeing from originating visited network to terminating home network  p. 59
5.8Routeing in terminating home network when user resides in this network  p. 60
5.9Routeing from terminating home network to the terminating visited network  p. 60
5.10Insertion of service related media in the originating home network  p. 69
5.11PS to CS SRVCC access transfer scenarios  p. 77
5.11.1General  p. 77
5.11.2PS to CS SRVCC information transfer during registration  p. 77
5.11.3PS to CS SRVCC access transfer for a call in the active phase without loopback  p. 81
5.11.4PS to CS SRVCC access transfer for a call in the active phase with loopback  p. 86
5.12Invocation and configuration of services during roaming in a visited network  p. 89
6Key Issues  p. 89
6.1Key Issue #1: Unnecessary correlation of CDRs when loopback is not active  p. 89
6.1.1Description  p. 89
6.1.2Assumptions  p. 90
6.1.3Current Status  p. 90
6.1.4Alternative Options  p. 90
6.1.4.1Alternative 1 - Loopback indication  p. 90
6.1.5Evaluation and Recommendation  p. 90
6.2Key Issue #2: Identification of home network  p. 90
6.2.1Description  p. 90
6.2.2Assumptions  p. 91
6.2.3Current Status  p. 91
6.2.4Alternative Options  p. 92
6.2.4.1Alternative 1 - Home Network Information from Registration Procedure  p. 92
6.2.4.2Alternative 2 - IOI sent in SIP INVITE Request and SIP 200 (OK) response  p. 92
6.2.4.3Alternative 3 - Use of other SIP header fields  p. 92
6.2.5Evaluation and Recommendation  p. 93
6.3Key Issue #3: Media Plane Interconnection is not reflected in any CDR  p. 93
6.3.1Description  p. 93
6.3.2Assumptions  p. 94
6.3.3Current Status  p. 94
6.3.4Alternative Options  p. 94
6.3.4.1Alternative 1 - LinkID  p. 94
6.3.4.2Alternative 2 - Connection Data within SDP  p. 95
6.3.5Evaluation and Recommendation  p. 95
6.4Other topics to be considered and recommendations  p. 96
6.4.1List of Early Media  p. 96
6.4.2Inter Operator Traffic Leg parameter (iotl)  p. 96
6.4.3Early media termination with SIP 199 response  p. 96
7Conclusions  p. 97
$Change History  p. 98

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