Contents

29.2353GPPInterworking between SIP-I based circuit-switched core network and other networksRelease 17TS

Foreword 9

1 Scope 10

2 References 10

3 Definitions and abbreviations 12

3.1 Definitions 12

3.2 Abbreviations 13

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 17

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 23

4.5.1 General 23

4.5.2 DTMF Interworking 23

4.6 Example Call flows 23

4.6.1 General 23

4.6.2 Incoming Call flows 24

4.6.2.1 Incoming Call – no preconditions in external network 24

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 37

5.3.1.3.1 Overlap Signalling 37

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 39

5.5.3 Interworking of Call Hold (HOLD) supplementary service 39

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

5.6 User Plane Interworking 39

5.6.1 General 39

5.6.2 DTMF 39

5.7 Example Call flows 40

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 41

6.2.1 General 41

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 42

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 43

6.6.1 General 43

6.6.2 Codec Negotiation from SIP-I on Nc to BICC Network 43

6.6.2.1 Sending of IAM 43

6.6.2.2 Sending of SDP Answer 43

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 44

6.7 DMTF Signalling Interworking applicable for all Calls between a BICC network and a SIP-I based circuit-switched core network 44

6.7.1 General 44

6.7.2 DTMF transfer from SIP-I on Nc to BICC network (Out-of-Band DTMF) 44

6.7.3 DTMF transfer from BICC network (Out-of-Band DTMF) to SIP-I on Nc 45

6.7.4 SIP-I on Nc interworking with BICC for Inband DTMF 46

6.8 User Plane Interworking 46

6.8.1 General 46

6.8.2 DTMF Interworking 46

6.9 Example Call flows 46

7 Interworking between a SIP-I based circuit-switched core network and the IP Multimedia (IM) Core Network (CN) Subsystem 47

7.1 Reference Model 47

7.1.1 General 47

7.1.2 Signalling interactions between network entities in the control plane 47

7.2 Signalling Interworking of a Call from the IP Multimedia Subsystem towards the SIP-I based circuit-switched core network 48

7.2.1 General 48

7.2.2 Exceptions from forwarding received SIP messages 49

7.2.3 Sending SIP INVITE request 49

7.2.4 Updating Precondition Information 50

7.2.5 SDP Codec Negotiation 50

7.2.6 MGW Selection 50

7.2.7 Autonomous Release 50

7.2.8 Further setting of SIP header values 50

7.3 Signalling Interworking of a Call from SIP-I based circuit-switched core network towards the IP Multimedia Subsystem 52

7.3.1 General 52

7.3.2 Exceptions from forwarding received SIP messages 52

7.3.3 Sending SIP INVITE request 53

7.3.4 Updating Precondition Information 53

7.3.5 Receipt of SIP redirect (3xx) response 54

7.3.6 SDP Codec Negotiation 54

7.3.7 MGW Selection 54

7.3.8 Autonomous Release 55

7.3.9 Handling of forked SIP Responses 55

7.3.9.1 SIP Dialogues 55

7.3.9.2 Reception of non-100 provisional Responses to initial INVITE 55

7.3.9.3 Reception of final Responses to initial INVITE 55

7.3.10 Further setting of SIP header values 56

7.4 DMTF Signalling Interworking applicable for all Calls between an IP Multimedia CN Subsystem and a SIP-I based circuit-switched core network 57

7.5 User Plane Interworking 57

7.5.1 General 57

7.5.2 DTMF Interworking 58

7.6 Example Call flows 58

7.6.1 General 58

7.6.2 Incoming Call flows 58

7.6.2.1 Successful Call Establishment and Call Release 58

7.6.2.2 Autonomous Release at MGCF 60

7.6.3 Outgoing Call flows 61

7.6.3.1 Outgoing Call, Sending of INVITE is deferred 61

7.6.3.2 Outgoing Call, Sending of INVITE is not deferred 62

7.6.3.3 Interworking with forked SIP INVITE Requests 64

7.7 CS CN Supplementary Services and IMS Supplementary Services 67

7.7.0 General 67

7.7.1 Number Identification Services 67

7.7.1.1 CS CN Supplementary Service – Calling Line Identification Presentation/Restriction (CLIP/CLIR) 67

7.7.1.2 CS CN Supplementary Service – Connected Line Identification Presentation /Restriction (COLP/COLR) 67

7.7.1.3 IMS Supplementary Service – Originating Identification Presentation (OIP) and Originating Identification Restriction (OIR) 67

7.7.1.4 IMS Supplementary Service – Terminating Identification Presentation (TIP) and Terminating Identification Restriction (TIR) 67

7.7.1.5 CS CN Supplementary Service – Direct Dialling In 67

7.7.1.6 CS CN Supplementary Service – Malicious Call Identification 68

7.7.1.7 IMS Supplementary Service – Malicious Communication Identification (MCID) 68

7.7.1.8 CS CN Supplementary Service – Subaddressing 68

7.7.2 Diversion Services 68

7.7.2.1 CS CN Supplementary Service – Call Forwarding Services (CFU, CFB, CFNRy, CFNRc) 68

7.7.2.2 CS CN Supplementary Service – Call Deflection (CD) 68

7.7.2.3 IMS Supplementary Service – Communication Diversion (CDIV) 68

7.7.3 Waiting Services 68

7.7.3.1 CS CN Supplementary Service – Call Waiting 68

7.7.3.2 IMS Supplementary Service – Communication Waiting (CW) 68

7.7.4 Hold Services 68

7.7.4.1 CS CN Supplementary Service – Call Hold 68

7.7.4.2 IMS Supplementary Service – Communication Hold (HOLD) 69

7.7.5 Multiparty Services 69

7.7.5.1 CS CN Supplementary Services – Conference Calling (CONF) and Three-Party (3PTY) 69

7.7.5.2 IMS Supplementary Service – Conference (CONF) 69

7.7.6 Closed User Group Service 69

7.7.6.1 CS CN Supplementary Service – Closed User Group (CUG) 69

7.7.6.2 IMS Supplementary Service – Closed User Group (CUG) 69

7.7.7 Charging Services 69

7.7.7.1 CS CN Supplementary Service – Advice of Charge (AoC) 69

7.7.7.2 IMS Supplementary Service – Advice of Charge (AOC) 69

7.7.7.3 CS CN Supplementary Service – International Telecommunication Charge Card (ITCC) 69

7.7.7.4 CS CN Supplementary Service – Reverse Charging (REV) 69

7.7.8 Barring Services 70

7.7.8.1 CS CN Supplementary Service – Barring of Outgoing Calls 70

7.7.8.2 CS CN Supplementary Service – Barring of Incoming Calls 70

7.7.8.3 CS CN Supplementary Service – Anonymous Call Rejection (ACR) 70

7.7.8.4 IMS Supplementary Service – Communication Barring (CB) 70

7.7.8.5 IMS Supplementary Service – Anonymous Communication Rejection (ACR) 70

7.7.9 Transfer Services 70

7.7.9.1 CS CN Supplementary Service – Explicit Call Transfer (ECT) 70

7.7.9.2 IMS Supplementary Service – Explicit CommunicationTransfer (ECT) 70

7.7.10 Call Completion Services 71

7.7.10.1 CS CN Supplementary Service – Completion of Calls to Busy Subscriber (CCBS) 71

7.7.10.2 CS CN Supplementary Service – Completion of Calls on No Reply (CCNR) 71

7.7.10.3 IMS Supplementary Service – Completion of Communications to Busy Subscriber (CCBS) and Completion of Communication on No Reply (CCNR) 71

7.7.11 Miscellaneous Services 71

7.7.11.1 CS CN Supplementary Service – Multi-Level Precedence and Pre-emption (MLPP) 71

7.7.11.2 CS CN Supplementary Service – Multiple Subscriber Profile (MSP) 71

7.7.11.3 CS CN Supplementary Service – Multicall 71

7.7.11.4 CS CN Supplementary Service – Calling Name Presentation 71

7.7.11.5 CS CN Supplementary Service – User-to-User Signalling (UUS) 71

7.7.11.6 IMS Supplementary Service – Message Waiting Indication (MWI) 71

7.7.11.7 CS CN Supplementary Service – Global Virtual Network Service (GVNS) 71

7.7.11.8 CS CN Supplementary Service – Terminal Portability (TP) 72

7.7.12 Customized Alerting Tones Services 72

7.7.12.1 CS CN Supplementary Service – Customized Alerting Tones (CAT) 72

7.7.12.2 IMS Supplementary Service – Customized Alerting Tones (CAT) for early session model 72

7.7.12.3 IMS Supplementary Service – Customized Alerting Tones (CAT) for forking model 72

7.7.12.4 IMS Supplementary Service – Customized Alerting Tones (CAT) for gateway model 72

7.8 MGCF – IM-MGW Interaction 72

7.8.1 General 72

7.8.2 Call related Procedures for Terminations towards the IM CN Subsystem 72

7.8.3 Call related Procedures for Terminations towards SIP-I based Circuit-switched Core Network 72

7.8.4 Non-call related procedures 73

Annex A (normative): Interconnecting functionalities in SIP-I based CS domain 74

A.1 General 74

A.2 Stage 2 Requirements 74

A.3 Border Control architecture 75

A.4 Void 75

A.5 Procedures at the CS-IBCF 75

A.5.1 General 75

A.5.2 CS-IBCF as an exit point 76

A.5.2.1 Initial requests 76

A.5.2.2 Subsequent requests 76

A.5.2.3 CS-IBCF-initiated call release 77

A.5.2.4 THIG functionality in the CS-IBCF 77

A.5.2.4.1 General 77

A.5.2.4.2 Encryption for network topology hiding 78

A.5.2.5 ALG functionality in the CS-IBCF 78

A.5.2.6 Screening of SIP-I signalling 78

A.5.2.6.1 General 78

A.5.2.6.2 CS-IBCF procedures for SIP headers 79

A.5.2.6.3 CS-IBCF procedures for SIP message bodies 79

A.5.2.7 Void 79

A.5.3 CS-IBCF as an entry point 79

A.5.3.1 Initial requests 79

A.5.3.2 Subsequent requests 79

A.5.3.3 CS-IBCF-initiated call release 80

A.5.3.4 THIG functionality in the CS-IBCF 80

A.5.3.4.1 General 80

A.5.3.4.2 Decryption for network topology hiding 81

A.5.3.5 ALG functionality in the CS-IBCF 81

A.5.3.6 Screening of SIP-I signalling 81

A.5.3.7 Void 81

A.6 Procedures at the CS-TrGW 82

A.6.1 Transport Plane Control procedures 82

A.7 CS-IBCF – CS-TrGW Interaction 82

A.7.1 General 82

A.7.1.1 Network Model 82

A.7.1.2 Signalling flows 82

A.7.1.2.1 Basic Procedures 82

A.7.1.2.1.1 Call Establishment 82

A.7.1.2.1.2 Call Release 85

A.7.1.2.2 Specific Use Cases 85

A.7.1.2.2.1 CS-IBCF as Entry Point, Call Establishment with IP Version Interworking 85

A.7.1.2.2.2 Hanging Termination Detection 86

A.7.1.2.2.3 Gate Management 87

A.7.1.2.2.4 QoS Packet Marking 87

A.7.1.2.2.5 IP Realms 88

A.7.1.2.2.6 Media Inactivity Detection 88

A.7.1.2.2.7 RTCP Handling 89

A.7.1.2.2.8 Bandwidth Policing 90

A.7.1.2.2.8.1 Overview 90

A.7.1.2.2.8.2 Bandwidth policing procedures 90

A.7.1.2.2.9 Through-Connection 91

A.7.1.2.2.10 Emergency Call 91

A.7.1.2.2.11 Interactive Connectivity Establishment 91

A.7.1.2.2.12 SDP Capability Negotiation (SDPCapNeg) 91

A.7.2 Ix Signalling Procedures 92

A.7.2.1 Introduction 92

A.7.2.2 Call Related Procedures 92

A.7.2.2.1 Reserve TrGW Connection Point 92

A.7.2.2.2 Configure TrGW Connection Point 95

A.7.2.2.3 Reserve and Configure TrGW Connection Point 98

A.7.2.2.4 Release TrGW Termination 101

A.7.2.2.5 IP Bearer Released 102

A.7.2.2.6 Media Inactivity Detection 102

A.7.2.2.7 Termination heartbeat indication 103

A.7.2.2.8 Change Through-Connection 103

A.7.2.3 Non-Call Related Procedures 104

A.7.2.3.1 Introduction 104

A.7.2.3.2 Realm Availability Change – Activate 105

A.7.2.3.3 Realm Availability Change – Indication 106

A.8 (G)MSC – CS-MGW Interaction 106

A.8.1 General 106

A.8.1.1 Network Model 106

A.8.1.2 Signalling flows 106

Annex B (normative): Additional Interworking Procedures between a SIP-I based circuit-switched Core Network and the IP Multimedia (IM) Core Network (CN) Subsystem to Support Special Services 108

B.1 General 108

B.2 Global Text Telephony 108

Annex C (informative): Change history 109