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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
Interworking between SIP-I based circuit-switched core
network and other networks
(3GPP TS 29.235 version 14.1.0 Release 14)
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3GPP TS 29.235 version 14.1.0 Release 14 1 ETSI TS 129 235 V14.1.0 (2019-01)
Reference
RTS/TSGC-0329235ve10
Keywords
GSM,LTE,UMTS
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3GPP TS 29.235 version 14.1.0 Release 14 2 ETSI TS 129 235 V14.1.0 (2019-01)
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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server) which are, or may be, or may become, essential to the present document.
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Foreword
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, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
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 29.235 version 14.1.0 Release 14 3 ETSI TS 129 235 V14.1.0 (2019-01)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 9
1 Scope . 10
2 References . 10
3 Definitions and abbreviations . 12
3.1 Definitions . 12
3.2 Abbreviations . 12
4 Interworking between a SIP-I based circuit-switched core network and an external SIP-I based
network . 14
4.1 Reference Model . 14
4.2 Signalling Interworking of a Call from the external SIP-I based network towards the SIP-I based circuit-
switched core network . 15
4.2.1 Interworking of SIP-I messages received from external SIP-I network . 15
4.2.1.1 General . 15
4.2.1.2 Call Release from external SIP-I network when encapsulated REL is missing . 15
4.2.2 Special Procedures for the reception of initial SIP INVITE requests . 15
4.2.2.1 Receipt of SIP INVITE request . 15
4.2.2.2 Receipt of SIP INVITE requests with SDP . 15
4.2.2.3 Receipt of SIP INVITE request without SDP . 15
4.2.2.4 MGW Selection . 16
4.2.3 Interworking of SIP-I messages received from succeeding 3GPP node . 16
4.2.4 Special Procedures for Profile Interworking . 16
4.2.4.1 Support of 100Rel . 16
4.2.4.2 Support for UPDATE method . 16
4.2.4.3 Support for Preconditions . 16
4.2.5 Support for Codec Negotiation . 17
4.2.6 Special Procedures for the reception of SIP Re-INVITE requests . 17
4.2.6.1 Receipt of SIP Re-INVITE request without SDP. 17
4.3 Signalling Interworking of a Call from SIP-I based circuit-switched core network towards the external
SIP-I based network . 18
4.3.1 Interworking of SIP-I messages received from preceding 3GPP node . 18
4.3.1.1 General . 18
4.3.1.2 Call Release from external SIP-I network when encapsulated REL is missing . 18
4.3.2 Special Procedures for the reception of SIP INVITE requests . 18
4.3.3 Special Procedures for Profile Interworking . 18
4.3.3.1 Support of 100Rel . 18
4.3.3.2 Support for UPDATE method . 19
4.3.3.3 Support for Preconditions . 19
4.3.4 Support for Codec Negotiation . 20
4.3.5 MGW Selection . 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 . 21
4.4.1 General . 21
4.4.2 DTMF support in SDP offer sent to External SIP-I network . 21
4.4.3 DTMF support in SDP offer received from External SIP-I network . 22
4.5 User Plane Interworking . 22
4.5.1 General . 22
4.5.2 DTMF Interworking . 23
4.6 Example Call flows . 23
4.6.1 General . 23
4.6.2 Incoming Call flows. 23
4.6.2.1 Incoming Call - no preconditions in external network . 23
ETSI
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3GPP TS 29.235 version 14.1.0 Release 14 4 ETSI TS 129 235 V14.1.0 (2019-01)
4.6.2.2 Incoming Call with preconditions not met . 26
4.6.3 Outgoing Call flows . 28
4.6.3.1 Outgoing Call with support for preconditions . 28
4.6.3.2 Outgoing Call with support of 100rel but no support for preconditions . 30
4.6.3.3 Outgoing Call without support for 100rel and preconditions . 32
5 Interworking between a SIP-I based circuit-switched core network and an ISUP based network . 34
5.1 Reference Model . 34
5.2 Control Plane Interworking . 34
5.3 Signalling Interworking of a Call from the ISUP based network towards the SIP-I based circuit-
switched core network . 36
5.3.1 General . 36
5.3.1.1 Sending of ISUP information to adjacent SIP nodes . 36
5.3.1.2 Receipt of encapsulated ISUP information within SIP-I . 36
5.3.1.3 Special procedures related to outgoing INVITE . 36
5.3.1.3.1 Overlap Signalling . 36
5.3.1.3.2 Coding of encapsulated ISUP IAM parameters in outgoing INVITE . 37
5.3.1.3.3 Media offered in SDP of outgoing INVITE . 37
5.4 Signalling Interworking of a Call from SIP-I based circuit-switched core network towards the ISUP
based network . 37
5.4.1 General . 37
5.4.2 Interworking of received ISUP messages to SIP messages . 37
5.4.3 Interworking of received SIP messages to ISUP messages . 37
5.4.3.1 Receipt of encapsulated ISUP information within SIP . 37
5.4.3.2 Special Procedures for the Reception of SIP INVITE request . 38
5.4.3.2.1 Propagation of overlap signalling toward the 3GPP CS domain . 38
5.4.3.2.2 Derivation of TMR, USI and HLC parameters within sent IAM message . 38
5.4.3.2.3 Receipt of SIP INVITE without SDP offer . 38
5.4.3.2.4 Special Procedures for deferred MGW selection procedure. . 38
5.5 Supplementary services . 38
5.5.1 Special procedures for supplementary service interworking . 38
5.5.2 Interworking of CLIP/CLIR supplementary service . 38
5.5.3 Interworking of Call Hold (HOLD) supplementary service . 38
5.5.4 Interworking of Completion of Calls to Busy Subscriber (CCBS) supplementary service to SIP
net works . 38
5.6 User Plane Interworking . 39
5.6.1 General . 39
5.6.2 DTMF . 39
5.7 Example Call flows . 39
6 Interworking between a SIP-I based circuit-switched core network and a BICC based network . 40
6.1 Reference Model . 40
6.2 Control Plane Interworking . 40
6.2.1 General . 40
6.2.2 Signalling interactions between network entities in the control plane . 41
6.3 Signalling Interworking of a Call from the BICC based network towards the SIP-I based circuit-
switched core network . 41
6.4 Signalling Interworking of a Call from SIP-I based circuit-switched core network towards the BICC
based network . 42
6.5 Supplementary services . 42
6.6 Codec Negotiation between a BICC based network and a SIP-I based circuit-switched core network . 42
6.6.1 General . 42
6.6.2 Codec Negotiation from SIP-I on Nc to BICC Network . 42
6.6.2.1 Sending of IAM . 42
6.6.2.2 Sending of SDP Answer . 42
6.6.2.3 Mid-call Codec Negotiation initiated from SIP-I on Nc . 43
6.6.3 Codec Negotiation from BICC Network to SIP-I on Nc . 43
6.6.3.1 Sending of initial SDP Offer . 43
6.6.3.2 Responding to Serving Node initiating Codec Negotiation . 43
6.6.3.3 Mid-call Codec Negotiation initiated from BICC . 43
6.7 DMTF Signalling Interworking applicable for all Calls between a BICC network and a SIP-I based
circuit-switched core network . 43
ETSI
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3GPP TS 29.235 version 14.1.0 Release 14 5 ETSI TS 129 235 V14.1.0 (2019-01)
6.7.1 General . 43
6.7.2 DTMF transfer from SIP-I on Nc to BICC network (Out-of-Band DTMF) . 43
6.7.3 DTMF transfer from BICC network (Out-of-Band DTMF) to SIP-I on Nc . 44
6.7.4 SIP-I on Nc interworking with BICC for Inband DTMF . 45
6.8 User Plane Interworking . 45
6.8.1 General . 45
6.8.2 DTMF Interworking . 45
6.9 Example Call flows . 45
7 Interworking between a SIP-I based circuit-switched core network and the IP Multimedia (IM)
Core Network (CN) Subsystem . 45
7.1 Reference Model . 45
7.1.1 General . 45
7.1.2 Signalling interactions between network entities in the control plane . 46
7.2 Signalling Interworking of a Call from the IP Multimedia Subsystem towards the SIP-I based circuit-
switched core network . 47
7.2.1 General . 47
7.2.2 Exceptions from forwarding received SIP messages . 47
7.2.3 Sending SIP INVITE request . 48
7.2.4 Updating Precondition Information . 48
7.2.5 SDP Codec Negotiation . 48
7.2.6 MGW Selection . 49
7.2.7 Autonomous Release . 49
7.2.8 Further setting of SIP header values . 49
7.3 Signalling Interworking of a Call from SIP-I based circuit-switched core network towards the IP
Multimedia Subsystem . 50
7.3.1 General . 50
7.3.2 Exceptions from forwarding received SIP messages . 51
7.3.3 Sending SIP INVITE request . 51
7.3.4 Updating Precondition Information . 52
7.3.5 Receipt of SIP redirect (3xx) response . 52
7.3.6 SDP Codec Negotiation . 52
7.3.7 MGW Selection . 53
7.3.8 Autonomous Release . 53
7.3.9 Handling of forked SIP Responses . 53
7.3.9.1 SIP Dialogues . 53
7.3.9.2 Reception of non-100 provisional Responses to initial INVITE . 53
7.3.9.3 Reception of final Responses to initial INVITE . 54
7.3.10 Further setting of SIP header values . 54
7.4 DMTF Signalling Interworking applicable for all Calls between an IP Multimedia CN Subsystem and a
SIP-I based circuit-switched core network . 55
7.5 User Plane Interworking . 55
7.5.1 General . 55
7.5.2 DTMF Interworking . 56
7.6 Example Call flows . 56
7.6.1 General . 56
7.6.2 Incoming Call flows. 56
7.6.2.1 Successful Call Establishment and Call Release . 56
7.6.2.2 Autonomous Release at MGCF . 58
7.6.3 Outgoing Call flows . 59
7.6.3.1 Outgoing Call, Sending of INVITE is deferred. 59
7.6.3.2 Outgoing Call, Sending of INVITE is not deferred . 60
7.6.3.3 Interworking with forked SIP INVITE Requests . 62
7.7 CS CN Supplementary Services and IMS Supplementary Services .
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