Foreword1 Scope2 References3 Definitions and abbreviations4 General5 Network characteristics6 Interworking with CS networks7 Control plane interworking7 Control plane interworking7.1 General7.2 Interworking between CS networks supporting ISUP and the IM CN subsystem7.2 Interworking between CS networks supporting ISUP and the IM CN subsystem7.2.1 Services performed by network entities in the control plane7.2.2 Signalling interactions between network entities in the control plane7.2.3 SIP-ISUP protocol interworking7.3 Interworking between CS networks supporting BICC and the IM CN subsystem7.4 Supplementary Services7.5 IMS Supplementary Services7.5 IMS Supplementary Services7.5.1 Originating Identification Presentation (OIP) and Originating Identification Restriction (OIR)7.5.2 Terminating Identification Presentation (TIP) and Terminating Identification Restriction (TIR)7.5.3 void7.5.4 Communication Diversion (CDIV)7.5.5 Communication Hold (HOLD)7.5.6 Conference call (CONF)7.5.7 Anonymous Communication Rejection (ACR) and Communication Barring (CB)7.5.8 Message Waiting Indication (MWI)7.5.9 Malicious Communication Identification (MCID)7.5.10 Closed User Group (CUG)7.5.11 CCBS/CCNR7.5.12 Communication Waiting (CW)7.5.13 Customized Alerting Tones (CAT)8 User plane interworking9 MGCF - IM-MGW Interaction9.1 Overview9.2 Mn signalling interactions9.2 Mn signalling interactions9.2.1 Network model9.2.2 Basic IM CN subsystem originated session9.2.3 Basic CS network originated session9.2.4 Session release initiated from IM CN subsystem side9.2.5 Session release initiated from CS network side9.2.6 Session release initiated by MGCF9.2.7 Session release initiated by IM-MGW9.2.8 Handling of RTP telephone events9.2.9 Session hold initiated from IM CN subsystem9.2.10 Session hold initiated from CS network9.2.11 Explicit Congestion Notification Support9.2.12 Interactive Connectivity Establishment Support9.2.13 Codec Parameters Handling9.2.14 SDP Capability Negotiation (SDPCapNeg)9.2.15 Rate adaptation for media endpoints9.3 Mn Signalling procedures9.4 Multimedia Priority Service (MPS) SupportB.1 IntroductionB.2 Control plane interworkingB.3 MGCF - IM-MGW interaction during interworking of codec negotiationC.1 Interworking SIP to ISUPC.2 Interworking ISUP to SIPE.1 Basic Multimedia calls interworking between the IMS and CS Networks scenariosE.2 Control plane interworkingE.2.1 GeneralE.2.2 Functionalities required in the MGCF for multimedia calls supportE.2.3 IM CN subsystem originated sessionE.2.4 CS network originated sessionE.2.5 Service changeE.2.6 Call releaseE.3 User plane interworkingE.4 MGCF and IM-MGW interactionsE.4.1 IntroductionE.4.2 Mn signalling interactionsE.4.2.1 IntroductionE.4.2.2 H.248 Context ModelE.4.2.3 Transport of H.245 messages between the MGCF and IM-MGWE.4.2.4 Call establishment procedureE.4.2.5 Handling of H.245 indication messageE.4.2.6 Handling of H.245 Command messageE.4.2.7 Mn Signalling Interactions to support the Media Oriented Negotiation Acceleration (MONA)E.4.2.8 Interworking between RTCP messages and H.245 messagesE.4.3 Mn Signalling proceduresF.1 ScopeF.2 MIME typeF.3 XML Schema definitionF.4 IANA registration templateH.1 Interworking SIP to ISUPH.2 Interworking ISUP to SIPI.1 Overview of GTT interworking between the IMS and Circuit Switched (CS) networksI.2 Control plane interworkingI.3 User plane interworkingI.4 MGCF and IM-MGW interactionsJ.1 IntroductionJ.2 IMS CAT provided by the terminating IMS user using gateway model towards user served in CS networksK.1 GeneralK.2 Recommend T.38 configurationK.3 Handling T.38 SDP attributes at the I-MGCFK.4 Handling T.38 SDP attributes at the O-MGCFK.5 Applicable T.38 SDP attributes at the Mn InterfaceL.0 GeneralL.1 Interworking SIP to ISUPL.2 Interworking ISUP to SIP 7.5.3 void 29.1633GPPInterworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networksTS Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM