Tech-invite 3GPPspace IETFspace

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Content for TS 29.235 Word version: 18.0.0

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4.1 Reference Model 4.2 Signalling Interworking of a Call from the external SIP-I based network towards the SIP-I based circuit-switched core network 4.3 Signalling Interworking of a Call from SIP-I based circuit-switched core network towards the external SIP-I based network 4.4 DMTF Signalling Interworking applicable for all Calls between an external SIP-I based network and a SIP-I based circuit-switched core network 4.5 User Plane Interworking 4.6 Example Call flows
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4 Interworking between a SIP-I based circuit-switched core network and an external SIP-I based network p. 14

4.1 Reference Model p. 14

4.2 Signalling Interworking of a Call from the external SIP-I based network towards the SIP-I based circuit-switched core network p. 15

4.2.1 Interworking of SIP-I messages received from external SIP-I network p. 15

4.2.1.1 General p. 15

4.2.1.2 Call Release from external SIP-I network when encapsulated REL is missing p. 15

4.2.2 Special Procedures for the reception of initial SIP INVITE requests p. 15

4.2.2.1 Receipt of SIP INVITE request p. 15

4.2.2.2 Receipt of SIP INVITE requests with SDP p. 15

4.2.2.3 Receipt of SIP INVITE request without SDP p. 15

4.2.2.4 MGW Selection p. 16

4.2.3 Interworking of SIP-I messages received from succeeding 3GPP node p. 16

4.2.4 Special Procedures for Profile Interworking p. 16

4.2.4.1 Support of 100Rel p. 16

4.2.4.2 Support for UPDATE method p. 16

4.2.4.3 Support for Preconditions p. 17

4.2.5 Support for Codec Negotiation p. 17

4.2.6 Special Procedures for the reception of SIP Re-INVITE requests p. 17

4.2.6.1 Receipt of SIP Re-INVITE request without SDP p. 17

4.3 Signalling Interworking of a Call from SIP-I based circuit-switched core network towards the external SIP-I based network p. 18

4.3.1 Interworking of SIP-I messages received from preceding 3GPP node p. 18

4.3.1.1 General p. 18

4.3.1.2 Call Release from external SIP-I network when encapsulated REL is missing p. 18

4.3.2 Special Procedures for the reception of SIP INVITE requests p. 18

4.3.3 Special Procedures for Profile Interworking p. 18

4.3.3.1 Support of 100Rel p. 18

4.3.3.2 Support for UPDATE method p. 19

4.3.3.3 Support for Preconditions p. 19

4.3.4 Support for Codec Negotiation p. 20

4.3.5 MGW Selection p. 20

4.4 DMTF Signalling Interworking applicable for all Calls between an external SIP-I based network and a SIP-I based circuit-switched core network p. 21

4.4.1 General p. 21

4.4.2 DTMF support in SDP offer sent to External SIP-I network p. 21

4.4.3 DTMF support in SDP offer received from External SIP-I network p. 22

4.5 User Plane Interworking p. 23

4.5.1 General p. 23

4.5.2 DTMF Interworking p. 23

4.6 Example Call flows p. 23

4.6.1 General p. 23

4.6.2 Incoming Call flows p. 24

4.6.2.1 Incoming Call - no preconditions in external network p. 24

4.6.2.2 Incoming Call with preconditions not met p. 26

4.6.3 Outgoing Call flows p. 28

4.6.3.1 Outgoing Call with support for preconditions p. 28

4.6.3.2 Outgoing Call with support of 100rel but no support for preconditions p. 30

4.6.3.3 Outgoing Call without support for 100rel and preconditions p. 32