Content for TS 29.163 Word version: 17.3.0
7 Control plane interworking
7.1 General
7.2 Interworking between CS networks supporting ISUP and the IM CN subsystem
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7 Control plane interworking p. 31
7.1 General p. 31
7.2 Interworking between CS networks supporting ISUP and the IM CN subsystem p. 32
7.2.1 Services performed by network entities in the control plane p. 32
7.2.1.1 Services performed by the SS7 signalling function p. 32
7.2.1.2 Services of the SGW p. 33
7.2.1.3 Services of the MGCF p. 33
7.2.1.4 Services of the SIP signalling function p. 33
7.2.2 Signalling interactions between network entities in the control plane p. 33
7.2.2.1 Signalling between the SS7 signalling function and MGCF p. 33
7.2.2.1.1 Signalling from MGCF to SS7 signalling function p. 33
7.2.2.1.2 Signalling from SS7 signalling function to MGCF p. 33
7.2.2.1.3 Services offered by SCTP and M3UA p. 33
7.2.2.2 Signalling between the MGCF and SIP signalling function p. 34
7.2.3 SIP-ISUP protocol interworking p. 34
7.2.3.1 Incoming call interworking from SIP to ISUP at I-MGCF p. 34
7.2.3.1.1 Sending of IAM p. 34
7.2.3.1.2 Coding of the IAM p. 35
7.2.3.1.2.0 General p. 35
7.2.3.1.2.1 Called party number p. 35
7.2.3.1.2.2 Nature of connection indicators p. 36
7.2.3.1.2.3 Forward call indicators p. 37
7.2.3.1.2.4 Calling party's category p. 38
7.2.3.1.2.4A Originating Line Information p. 38
7.2.3.1.2.5 Transmission medium requirement p. 38
7.2.3.1.2.5a Transmission medium requirement prime and USI prime (optional) p. 40
7.2.3.1.2.6 Calling party number p. 42
7.2.3.1.2.7 Generic number p. 46
7.2.3.1.2.8 User service information p. 46
7.2.3.1.2.9 Hop Counter (National option) p. 47
7.2.3.1.2.10 Progress Indicator p. 47
7.2.3.1.2.11 Location Number p. 47
7.2.3.1.2.12 Support of ICS call p. 49
7.2.3.1.2.13 UID capability indicators (National option) p. 49
7.2.3.1.2.14 Called IN number and original called IN number (optional) p. 50
7.2.3.1.2A Coding of the IAM when Number Portability is supported |R8| p. 50
7.2.3.1.2A.1 Coding of the IAM when a Number Portability Routing Number is available p. 50
7.2.3.1.2A.2 Number Portability Forward Information p. 53
7.2.3.1.2B Coding of the IAM for Carrier Routeing |R8| p. 53
7.2.3.1.2B.1 Coding of the IAM when a Carrier Identification Code (CIC) is present p. 53
7.2.3.1.2B.2 Void
7.2.3.1.3 Sending of COT p. 53
7.2.3.1.3A Sending of SAM |R8| p. 54
7.2.3.1.3A.1 General p. 54
7.2.3.1.3A.2 Additional digits received in in-dialog SIP INFO requests p. 54
7.2.3.1.3A.3 Additional digits received in SIP INVITE requests p. 54
7.2.3.1.4 Sending of 180 ringing p. 55
7.2.3.1.4.0 General p. 55
7.2.3.1.4.0a PSTN XML body p. 56
7.2.3.1.4.0b Fallback by I-MGCF p. 57
7.2.3.1.4.1 Fallback in a succeeding network: Transmission Medium Used parameter (TMU) received p. 58
7.2.3.1.4A Sending of 183 Session Progress for early media scenarios |R7| p. 58
7.2.3.1.4B Sending of 181Call is being forwarded |R7| p. 61
7.2.3.1.4C Sending of 183 Session Progress for overlap signalling using the in-dialog method |R8| p. 62
7.2.3.1.4D Sending of 183 Session Progress to carry ISUP Cause |R9| p. 62
7.2.3.1.4E Sending of 183 Session Progress for ICS call |R12| p. 62
7.2.3.1.5 Sending of the 200 OK (INVITE) p. 63
7.2.3.1.6 Sending of the Release message (REL) p. 65
7.2.3.1.7 Coding of the REL p. 65
7.2.3.1.8 Receipt of the Release Message p. 67
7.2.3.1.9 Receipt of RSC, GRS or CGB (H/W oriented) p. 70
7.2.3.1.9a Receipt of REFER |R7| p. 70
7.2.3.1.10 Autonomous Release at I-MGCF p. 71
7.2.3.1.11 Internal through connection of the bearer path p. 71
7.2.3.2 Outgoing Call Interworking from ISUP to SIP at O-MGCF p. 71
7.2.3.2.1 Sending of INVITE p. 71
7.2.3.2.1.1 General p. 71
7.2.3.2.1.2 Interaction with continuity check p. 72
7.2.3.2.1.3 IAM without calling party number p. 72
7.2.3.2.1.4 Terminating overlap signalling at MGCF p. 73
7.2.3.2.1.5 Fallback (optional) p. 73
7.2.3.2.1a Sending of INVITE without determining the end of address signalling |R7| p. 74
7.2.3.2.1a.1 General p. 74
7.2.3.2.1a.2 Additional digits sent with in-dialog overlap method p. 74
7.2.3.2.1a.3 Additional digits sent using the multiple INVITEs overlap method p. 75
7.2.3.2.2 Coding of the INVITE p. 76
7.2.3.2.2.0 Overview p. 76
7.2.3.2.2.1 Request-URI and To header field p. 76
7.2.3.2.2.2 SDP Media Description p. 77
7.2.3.2.2.3 P-Asserted-Identity, From and Privacy header fields p. 80
7.2.3.2.2.3A "cpc" URI Parameter in P-Asserted-Identity Header p. 85
7.2.3.2.2.3B "oli" URI Parameter in P-Asserted-Identity Header p. 85
7.2.3.2.2.4 Max Forwards header p. 86
7.2.3.2.2.5 IMS Communication Service Identifier p. 86
7.2.3.2.2.6 P-Early-Media header field p. 86
7.2.3.2.2.7 PSTN XML elements p. 86
7.2.3.2.2.8 Progress indicator p. 87
7.2.3.2.2.9 P-Access-Network-Info p. 88
7.2.3.2.2A Coding of the INVITE when Number Portability is supported |R8| p. 88
7.2.3.2.2B Coding of the INVITE for Carrier Routeing |R8| p. 90
7.2.3.2.2C Coding of INVITE with instance-id in form of IMEI URN |R9| p. 90
7.2.3.2.2.10 PSAP Call-back indication p. 91
7.2.3.2.2.11 History-Info header field (optional) p. 91
7.2.3.2.3 Receipt of CONTINUITY p. 91
7.2.3.2.4 Sending of ACM and awaiting answer indication p. 92
7.2.3.2.5 Coding of the ACM p. 94
7.2.3.2.5.0 General p. 94
7.2.3.2.5.1 Backward call indicators p. 95
7.2.3.2.5.2 Optional Backward call indicators p. 96
7.2.3.2.5.3 Access Transport Parameter, Transmission medium used parameter p. 96
7.2.3.2.5.4 Progress indicator p. 97
7.2.3.2.5.5 Cause Value p. 97
7.2.3.2.6 Sending of the Call Progress message (CPG) p. 97
7.2.3.2.7 Coding of the CPG p. 99
7.2.3.2.7.0 General p. 99
7.2.3.2.7.1 Event information p. 100
7.2.3.2.7.2 Access Transport Parameter p. 100
7.2.3.2.7.3 Void
7.2.3.2.7.4 Handling of Backward Call indicators p. 100
7.2.3.2.7.5 Optional Backward call indicators p. 100
7.2.3.2.7.6 Cause Value p. 100
7.2.3.2.7a Receipt of 200 OK(INVITE) p. 101
7.2.3.2.7b Internal through connection of the bearer path |R7| p. 101
7.2.3.2.8 Sending of the Answer Message (ANM) p. 101
7.2.3.2.9 Coding of the ANM p. 101
7.2.3.2.9.1 Backwards Call Indicators p. 101
7.2.3.2.9.2 Access Transport Parameter p. 101
7.2.3.2.9.3 Transmission Medium Used parameter (TMU) p. 102
7.2.3.2.10 Sending of the Connect message (CON) p. 103
7.2.3.2.11 Coding of the CON p. 103
7.2.3.2.11.0 General p. 103
7.2.3.2.11.1 Backward call indicators p. 103
7.2.3.2.11.2 Access Transport Parameter p. 103
7.2.3.2.11.3 Transmission medium used parameter p. 103
7.2.3.2.11A Receipt of a reINVITE request |R8| p. 103
7.2.3.2.12 Receipt of Status Codes 4xx, 5xx or 6xx p. 103
7.2.3.2.13 Receipt of a BYE p. 106
7.2.3.2.14 Receipt of the Release Message p. 106
7.2.3.2.15 Receipt of RSC, GRS or CGB (H/W oriented) p. 107
7.2.3.2.16 Autonomous Release at O-MGCF p. 107
7.2.3.2.17 Special handling of 580 precondition failure received in response to either an INVITE or UPDATE p. 107
7.2.3.2.17.1 580 Precondition failure response to an INVITE p. 107
7.2.3.2.17.2 580 Precondition failure response to an UPDATE within an early dialog p. 107
7.2.3.2.18 Sending of CANCEL p. 108
7.2.3.2.19 Receipt of SIP redirect (3xx) response p. 108
7.2.3.2.20 Sending of INFO for overlap signalling using the in-dialog method |R8| p. 108
7.2.3.2.20.1 General p. 108
7.2.3.2.20.2 Encoding of the INFO p. 108
7.2.3.3 Timers p. 109
