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Content for TR 32.850 Word version: 14.0.0

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2 References p. 6

3 Definitions, symbols and abbreviations p. 8

3.1 Definitions p. 8

3.2 Symbols p. 8

3.3 Abbreviations p. 8

4 Overview p. 9

4.1 General p. 9

4.2 Consideration of different Application Server (AS) types and roles p. 10

4.3 Identifiers used for application differentiation p. 11

4.3.1 IMS Communication Service Identifier (ICSI) p. 11

4.3.2 IMS Application Reference Identifier (IARI) p. 12

4.4 Charging correlation p. 12

4.4.1 General p. 12

4.4.2 Charging data correlation p. 13

4.4.3 SIP Identifier used for charging correlation p. 13

4.4.3.1 IMS Charging Identifier (ICID) p. 13

4.4.3.2 Related ICID p. 14

4.4.3.3 Access network charging identifier p. 14

4.4.3.4 Inter Operator Identifier (IOI) p. 14

4.4.3.5 IMS visited network identifier p. 14

4.4.3.6 Loopback Indication p. 14

4.4.3.7 Session-ID p. 14

4.4.3.8 Outgoing Session-ID p. 14

4.4.4 SIP Identifier used for dialog correlation p. 15

4.4.4.1 Original dialog identifier p. 15

4.5 Comparison of S-CSCF and AS CDR for correlation purposes p. 15

5 Description of scenarios p. 20

5.1 Methodology p. 20

5.2 Scenario 1 MMTel p. 20

5.2.1 Description of scenario p. 20

5.2.2 Further considerations with the MMTEL when acting as B2BUA p. 21

5.3 Scenario 2 TelCo enterprise service p. 22

5.4 Scenario 3: Enhanced Multimedia Telephony (EMT) p. 23

5.5 Scenario 4: Small Business Telephony (SBT) p. 24

5.6 Scenario 5: Charging information from all IMS NEs including AS p. 25

6 Key Issues p. 26

6.1 Key Issue #1 p. 26

6.1.1 General p. 26

6.1.2 Description p. 26

6.1.3 Assumptions p. 27

6.1.4 Current status p. 27

6.1.5 Alternative options p. 27

6.1.5.1 Alternative 1 - SIP information which element writes a CR p. 27

6.1.5.2 Alternative 2 - Furnish Charging Information to CTF p. 27

6.1.5.3 Alternative 3 - Definition of a type of call p. 28

6.1.5.4 Alternative 4 - Subscribe/Notify for CDR events p. 29

6.1.6 Evaluation and recommendation p. 29

6.1.6.1 Evaluation p. 29

6.1.6.2 Recommendation p. 31

6.2 Key Issue #2: p. 31

6.2.1 Description p. 31

6.2.2 Assumptions p. 31

6.2.3 Current status p. 31

6.2.4 Alternative options p. 32

6.2.4.1 Alternative 1 - SIP Indication which Application is involved in Call p. 32

6.2.4.2 Alternative 2 - One CDR per AS p. 32

6.2.5 Evaluation p. 32

7 Conclusions p. 33

$ Change History p. 34