Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks (3GPP TS 29.163 version 14.13.0 Release 14)

RTS/TSGC-0329163ved0

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Status
Published
Publication Date
09-Oct-2019
Current Stage
12 - Completion
Completion Date
10-Oct-2019
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ETSI TS 129 163 V14.13.0 (2019-10) - Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks (3GPP TS 29.163 version 14.13.0 Release 14)
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ETSI TS 129 163 V14.13.0 (2019-10)






TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
Interworking between the IP Multimedia (IM) Core Network (CN)
subsystem and Circuit Switched (CS) networks
(3GPP TS 29.163 version 14.13.0 Release 14)

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3GPP TS 29.163 version 14.13.0 Release 14 1 ETSI TS 129 163 V14.13.0 (2019-10)



Reference
RTS/TSGC-0329163ved0
Keywords
GSM,LTE,UMTS
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3GPP TS 29.163 version 14.13.0 Release 14 2 ETSI TS 129 163 V14.13.0 (2019-10)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
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Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
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Legal Notice
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities. These shall be
interpreted as being references to the corresponding ETSI deliverables.
The cross reference between 3GPP and ETSI identities can be found under http://webapp.etsi.org/key/queryform.asp.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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3GPP TS 29.163 version 14.13.0 Release 14 3 ETSI TS 129 163 V14.13.0 (2019-10)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 17
1 Scope . 18
2 References . 18
3 Definitions and abbreviations . 24
3.1 Definitions . 24
3.2 Abbreviations . 25
4 General . 27
4.1 General interworking overview . 27
5 Network characteristics . 27
5.1 Key characteristics of ISUP/BICC based CS networks . 27
5.2 Key characteristics of IM CN subsystem . 27
6 Interworking with CS networks . 27
6.1 Interworking reference model . 27
6.1.1 Interworking reference points and interfaces . 28
6.1.2 Interworking functional entities . 28
6.1.2.1 Signalling Gateway Function (SGW) . 28
6.1.2.2 Media Gateway Control Function (MGCF) . 28
6.1.2.3 IP Multimedia - Media Gateway Function (IM-MGW) . 28
6.2 Control plane interworking model . 29
6.3 User plane interworking model . 29
7 Control plane interworking . 29
7.1 General . 29
7.2 Interworking between CS networks supporting ISUP and the IM CN subsystem . 30
7.2.1 Services performed by network entities in the control plane . 30
7.2.1.1 Services performed by the SS7 signalling function . 30
7.2.1.2 Services of the SGW . 30
7.2.1.3 Services of the MGCF . 31
7.2.1.4 Services of the SIP signalling function . 31
7.2.2 Signalling interactions between network entities in the control plane . 31
7.2.2.1 Signalling between the SS7 signalling function and MGCF . 31
7.2.2.1.1 Signalling from MGCF to SS7 signalling function . 31
7.2.2.1.2 Signalling from SS7 signalling function to MGCF . 31
7.2.2.1.3 Services offered by SCTP and M3UA . 31
7.2.2.1.3.1 Services offered by SCTP . 31
7.2.2.1.3.2 Services offered by M3UA . 31
7.2.2.2 Signalling between the MGCF and SIP signalling function. 32
7.2.3 SIP-ISUP protocol interworking . 32
7.2.3.1 Incoming call interworking from SIP to ISUP at I-MGCF . 32
7.2.3.1.1 Sending of IAM . 32
7.2.3.1.2 Coding of the IAM . 33
7.2.3.1.2.0 General . 33
7.2.3.1.2.1 Called party number . 33
7.2.3.1.2.2 Nature of connection indicators . 34
7.2.3.1.2.3 Forward call indicators . 35
7.2.3.1.2.4 Calling party's category . 36
7.2.3.1.2.4A Originating Line Information . 36
7.2.3.1.2.5 Transmission medium requirement . 36
7.2.3.1.2.5a Transmission medium requirement prime and USI prime (optional) . 38
7.2.3.1.2.6 Calling party number . 40
ETSI

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3GPP TS 29.163 version 14.13.0 Release 14 4 ETSI TS 129 163 V14.13.0 (2019-10)
7.2.3.1.2.7 Generic number . 45
7.2.3.1.2.8 User service information . 45
7.2.3.1.2.9 Hop Counter (National option) . 45
7.2.3.1.2.10 Progress Indicator . 46
7.2.3.1.2.11 Location Number . 46
7.2.3.1.2.12 Support of ICS call . 48
7.2.3.1.2.13 UID capability indicators (National option) . 48
7.2.3.1.2.14 Called IN number and original called IN number (optional) . 49
7.2.3.1.2A Coding of the IAM when Number Portability is supported . 49
7.2.3.1.2A.1 Coding of the IAM when a Number Portability Routing Number is available . 49
7.2.3.1.2A.1.1 Separate Directory Number Addressing Method . 50
7.2.3.1.2A.1.2 Concatenated Addressing Method . 51
7.2.3.1.2A.1.3 Separate Network Routing Number Addressing Method . 51
7.2.3.1.2A.2 Number Portability Forward Information . 52
7.2.3.1.2B Coding of the IAM for Carrier Routeing . 52
7.2.3.1.2B.1 Coding of the IAM when a Carrier Identification Code (CIC) is present . 52
7.2.3.1.2B.2 Void . 52
7.2.3.1.3 Sending of COT . 52
7.2.3.1.3A Sending of SAM . 53
7.2.3.1.3A.1 General . 53
7.2.3.1.3A.2 Additional digits received in in-dialog SIP INFO requests . 53
7.2.3.1.3A.3 Additional digits received in SIP INVITE requests . 53
7.2.3.1.4 Sending of 180 ringing . 54
7.2.3.1.4.0 General . 54
7.2.3.1.4.0a PSTN XML body . 55
7.2.3.1.4.0b Fallback by I-MGCF . 56
7.2.3.1.4.1 Fallback in a succeeding network: Transmission Medium Used parameter (TMU)
received . 57
7.2.3.1.4A Sending of 183 Session Progress for early media scenarios . 57
7.2.3.1.4B Sending of 181Call is being forwarded . 60
7.2.3.1.4C Sending of 183 Session Progress for overlap signalling using the in-dialog method . 61
7.2.3.1.4D Sending of 183 Session Progress to carry ISUP Cause . 61
7.2.3.1.4E Sending of 183 Session Progress for ICS call . 61
7.2.3.1.5 Sending of the 200 OK (INVITE) . 62
7.2.3.1.6 Sending of the Release message (REL) . 64
7.2.3.1.7 Coding of the REL. 64
7.2.3.1.8 Receipt of the Release Message . 66
7.2.3.1.9 Receipt of RSC, GRS or CGB (H/W oriented) . 70
7.2.3.1.9a Receipt of REFER . 70
7.2.3.1.10 Autonomous Release at I-MGCF . 71
7.2.3.1.11 Internal through connection of the bearer path . 71
7.2.3.2 Outgoing Call Interworking from ISUP to SIP at O-MGCF . 71
7.2.3.2.1 Sending of INVITE . 71
7.2.3.2.1.1 General . 71
7.2.3.2.1.2 Interaction with continuity check . 72
7.2.3.2.1.3 IAM without calling party number . 72
7.2.3.2.1.4 Terminating overlap signalling at MGCF . 73
7.2.3.2.1.5 Fallback (optional) . 73
7.2.3.2.1a Sending of INVITE without determining the end of address signalling . 74
7.2.3.2.1a.1 General . 74
7.2.3.2.1a.2 Additional digits sent with in-dialog overlap method . 74
7.2.3.2.1a.3 Additional digits sent using the multiple INVITEs overlap method . 75
7.2.3.2.2 Coding of the INVITE . 76
7.2.3.2.2.0 Overview . 76
7.2.3.2.2.1 Request-URI and To header field . 76
7.2.3.2.2.2 SDP Media Description . 77
7.2.3.2.2.3 P-Asserted-Identity, From and Privacy header fields . 81
7.2.3.2.2.3A "cpc" URI Parameter in P-Asserted-Identity Header . 86
7.2.3.2.2.3B "oli" URI Parameter in P-Asserted-Identity Header . 86
7.2.3.2.2.4 Max Forwards header . 87
7.2.3.2.2.5 IMS Communication Service Identifier . 87
7.2.3.2.2.6 P-Early-Media header field . 87
ETSI

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3GPP TS 29.163 version 14.13.0 Release 14 5 ETSI TS 129 163 V14.13.0 (2019-10)
7.2.3.2.2.7 PSTN XML elements . 87
7.2.3.2.2.8 Progress indicator . 88
7.2.3.2.2.9 P-Access-Network-Info . 89
7.2.3.2.2A Coding of the INVITE when Number Portability is supported . 89
7.2.3.2.2A.1 Request-URI and To header field . 89
7.2.3.2.2A.1.1 Separate Directory Number Addressing Method . 90
7.2.3.2.2A.1.2 Concatenated Addressing Method . 90
7.2.3.2.2A.1.3 Separate Network Routing Number Addressing Method . 91
7.2.3.2.2B Coding of the INVITE for Carrier Routeing . 91
7.2.3.2.2B.1 Mapping of "cic" in Request-URI . 91
7.2.3.2.2B.2 Void . 91
7.2.3.2.2C Coding of INVITE with instance-id in form of IMEI URN . 91
7.2.3.2.2.10 PSAP Call-back indication . 92
7.2.3.2.2.11 History-Info header field (optional) . 92
7.2.3.2.3 Receipt of CONTINUITY . 92
7.2.3.2.4 Sending of ACM and awaiting answer indication . 93
7.2.3.2.5 Coding of the ACM . 95
7.2.3.2.5.0 General . 95
7.2.3.2.5.1 Backward call indicators . 95
7.2.3.2.5.2 Optional Backward call indicators . 97
7.2.3.2.5.3 Access Transport Parameter, Transmission medium used parameter . 97
7.2.3.2.5.4 Progress indicator . 98
7.2.3.2.5.5 Cause Value . 98
7.2.3.2.6 Sending of the Call Progress message (CPG) . 98
7.2.3.2.6.0 General . 98
7.2.3.2.6.1 Handling of the progress indicator . 100
7.2.3.2.7 Coding of the CPG . 100
7.2.3.2.7.0 General . 100
7.2.3.2.7.1 Event information . 101
7.2.3.2.7.2 Access Transport Parameter. 101
7.2.3.2.7.3 Void . 101
7.2.3.2.7.4 Handling of Backward Call indicators . 101
7.2.3.2.7.5 Optional Backward call indicators . 101
7.2.3.2.7.6 Cause Value . 101
7.2.3.2.7a Receipt of 200 OK(INVITE) . 102
7.2.3.2.7b Internal through connection of the bearer path . 102
7.2.3.2.8 Sending of the Answer Message (ANM) . 102
7.2.3.2.9 Coding of the ANM . 102
7.2.3.2.9.1 Backwards Call Indicators . 102
7.2.3.2.9.2 Access Transport Parameter. 102
7.2.3.2.9.3 Transmission Medium Used parameter (TMU) . 103
7.2.3.2.10 Sending of the Connect message (CON) . 104
7.2.3.2.11 Coding of the CON . 104
7.2.3.2.11.0 General . 104
7.2.3.2.11.1 Backward call indicators . 104
7.2.3.2.11.2 Access Transport Parameter. 104
7.2.3.2.11.3 Transmission medium used parameter . 104
7.2.3.2.11A Receipt of a reINVITE request . 104
7.2.3.2.12 Receipt of Status Codes 4xx, 5xx or 6xx . 104
7.2.3.2.12.1 Special handling of 404 Not Found and 484 Address Incomplete responses after sending

of INVITE without determining the end of address signalling . 107
7.2.3 2.13 Receipt of a BYE . 107
7.2.3.2.14 Receipt of the Release Message . 107
7.2.3.2.15 Receipt of RSC, GRS or CGB (H/W oriented) . 107
7.2.3.2.16 Autonomous Release at O-MGCF . 108
7.2.3.2.17 Special handling of
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