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Content for TS 24.279 Word version: 17.0.0

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4 Common capability information and identifiers for CS-first and IMS-first scenarios p. 8

4.1 UE capability exchange - overview p. 8

4.2 Personal ME identifier p. 9

4.3 UE capability version p. 9

4.4 Radio environment information p. 9

4.5 IM Status p. 9

5 Common procedures for CS-first and IMS-first scenarios p. 10

5.1 Registration of UE capabilities p. 10

5.2 Criteria for initiating capability exchange p. 10

5.3 Criteria for responding to a capability exchange request p. 10

5.4 Exchange of radio environment information and IM Status p. 11

5.5 Storage of capabilities in the UE p. 11

6 Combining a CS call with an existing IM session p. 11

6.1 Introduction p. 11

6.2 Functional entities p. 11

6.2.1 User equipment p. 11

6.2.2 Application server (AS) p. 11

6.3 Roles p. 11

6.3.1 CSI user agent (CUA) p. 11

6.3.1.1 General p. 11

6.3.1.2 Exchange of UE capability information - IM session first scenario p. 11

6.3.1.3 Session set-up - originating case p. 12

6.3.1.4 Session set-up - terminating case p. 13

6.3.1.5 CS call set-up - originating case p. 13

6.3.1.6 CS call set-up - terminating case p. 13

6.3.1.7 SDP exchange - UE capability information exchange p. 14

6.3.1.8 SDP offer answer - originating case p. 14

6.3.1.9 SDP offer answer - terminating case p. 14

7 Combining an IM session with an existing CS call p. 14

7.1 Introduction p. 14

7.2 Functional entities p. 14

7.2.1 User equipment p. 14

7.2.2 Application server (AS) p. 14

7.3 Roles p. 15

7.3.1 CSI user agent (CUA) p. 15

7.3.1.1 General p. 15

7.3.1.2 Exchange of UE capability information - CS first scenario p. 15

7.3.1.3 Session set-up - originating case p. 15

7.3.1.4 Session set-up - terminating case p. 16

7.3.1.5 CS call set-up - originating case p. 16

7.3.1.6 CS call set-up - terminating case p. 17

7.3.1.7 SDP exchange - UE capability information exchange p. 17

7.3.1.8 SDP offer-answer - originating case p. 17

7.3.1.9 SDP offer-answer - terminating case p. 17

8 Interaction with supplementary services p. 18

8.1 Roles p. 18

8.1.1 CSI user agent (CUA) p. 18

8.1.2 CSI application server (CSI AS) p. 18

8.1.2.1 Introduction p. 18

8.1.2.2 Call Forwarding and Call Barring p. 18

8.2.1.3 Call Completion p. 18

9 IMS origination and CSI termination p. 18

9.1 Introduction p. 18

9.2 Functional entities p. 18

9.2.1 User equipment p. 18

9.2.2 Application server (AS) p. 19

9.2.3 MGCF p. 19

9.3 Roles p. 19

9.3.1 Void

9.3.2 CSI UA (CUA) p. 19

9.3.3 CSI AS p. 19

9.3.3.1 General p. 19

9.3.3.2 Retrieval of public user identity information p. 19

9.3.3.3 Session Splitting towards terminating CUA p. 20

9.3.3.3.1 General p. 20

9.3.3.3.2 Call Initiation towards the CS domain p. 20

9.3.3.3.3 Session Initiation towards the IM CN subsystem p. 20

9.3.3.3.4 Subsequent requests p. 21

9.3.3.4 Session Modification p. 21

9.3.3.4.1 Adding an IM Session to an existing CS call p. 21

9.3.3.4.2 Adding a CS call to an existing IMS Session p. 22

9.3.3.4.3 Modifying an existing CS call and an existing IMS Session p. 22

9.3.3.5 Session Combining p. 23

9.3.3.6 Session Release p. 25

9.3.3.7 Unregistered Service p. 26

9.3.3.8 Capability exchange with the CSI UE p. 26

A (Normative) Media feature tags defined within the current document p. 26

A.1 General p. 26

A.2 Definition of media feature tag g.3gpp.cs-voice p. 27

A.3 Definition of media feature tag g.3gpp.cs-video p. 27

B Example signalling flows for the combining of CS calls with IM sessions p. 27

B.1 Scope of signalling flows p. 27

B.2 Introduction p. 28

B.2.1 General p. 28

B.2.2 Key required to interpret signalling flows p. 28

B.3 Signalling flows demonstrating CSI session setup when no CS call has yet been set up p. 29

B.3.1 Introduction p. 29

B.3.2 Establishing a CSI session when no CS call has yet been set up p. 29

B.4 Signalling flows demonstrating CSI session setup when a CS call is already established p. 38

B.4.1 Introduction p. 38

B.4.2 Establishing a CSI session when CS call has been setup p. 38

B.5 Signalling flows demonstrating capability information exchange in a CS call (only) p. 48

B.5.1 Introduction p. 48

B.5.2 Establishing a CS call from a CSI capable UE p. 48

B.6 Signalling flows demonstrating UE capability exchange with no UE capability version p. 51

B.6.1 Introduction p. 51

B.6.2 UE capability exchange outside a CS call p. 51

B.6.3 UE capability exchange when a CS call is already in progress p. 59

B.7 Signalling flows demonstrating UE capability exchange with UE capability version p. 62

B.7.1 Introduction p. 62

B.7.2 UE capability exchange with UE capability version p. 62

B.8 Signalling flows demonstrating an IMS multimedia session setup with IMS origination and CSI termination. p. 66

B.8.1 Introduction p. 66

B.8.2 CSI interworking function establishing a combinational CS call and an IMS session to a terminating UE p. 66

$ Change history p. 79