Tech-invite 3GPPspace IETFspace

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Content for TS 29.235 Word version: 17.0.0

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5.1 Reference Model 5.2 Control Plane Interworking 5.3 Signalling Interworking of a Call from the ISUP based network towards the SIP-I based circuit-switched core network 5.4 Signalling Interworking of a Call from SIP-I based circuit-switched core network towards the ISUP based network 5.5 Supplementary services 5.6 User Plane Interworking 5.7 Example Call flows
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5 Interworking between a SIP-I based circuit-switched core network and an ISUP based network p. 34

5.1 Reference Model p. 34

5.2 Control Plane Interworking p. 34

5.3 Signalling Interworking of a Call from the ISUP based network towards the SIP-I based circuit-switched core network p. 36

5.3.1 General p. 36

5.3.1.1 Sending of ISUP information to adjacent SIP nodes p. 36

5.3.1.2 Receipt of encapsulated ISUP information within SIP-I p. 36

5.3.1.3 Special procedures related to outgoing INVITE p. 37

5.3.1.3.1 Overlap Signalling p. 37

5.3.1.3.2 Coding of encapsulated ISUP IAM parameters in outgoing INVITE p. 37

5.3.1.3.3 Media offered in SDP of outgoing INVITE p. 37

5.4 Signalling Interworking of a Call from SIP-I based circuit-switched core network towards the ISUP based network p. 37

5.4.1 General p. 37

5.4.2 Interworking of received ISUP messages to SIP messages p. 37

5.4.3 Interworking of received SIP messages to ISUP messages p. 37

5.4.3.1 Receipt of encapsulated ISUP information within SIP p. 37

5.4.3.2 Special Procedures for the Reception of SIP INVITE request p. 38

5.4.3.2.1 Propagation of overlap signalling toward the 3GPP CS domain p. 38

5.4.3.2.2 Derivation of TMR, USI and HLC parameters within sent IAM message p. 38

5.4.3.2.3 Receipt of SIP INVITE without SDP offer p. 38

5.4.3.2.4 Special Procedures for deferred MGW selection procedure. p. 38

5.5 Supplementary services p. 38

5.5.1 Special procedures for supplementary service interworking p. 38

5.5.2 Interworking of CLIP/CLIR supplementary service p. 39

5.5.3 Interworking of Call Hold (HOLD) supplementary service p. 39

5.5.4 Interworking of Completion of Calls to Busy Subscriber (CCBS) supplementary service to SIP networks p. 39

5.6 User Plane Interworking p. 39

5.6.1 General p. 39

5.6.2 DTMF p. 39

5.7 Example Call flows p. 40