A.8 (G)MSC – CS-MGW Interaction
29.2353GPPInterworking between SIP-I based circuit-switched core network and other networksRelease 17TS
A.8.1 General
A.8.1.1 Network Model
figure A.8.1.1.1 shows the network model. The squared line represents the call control signalling. The dotted line represents the bearer control signalling (if applicable) and the user plane. The (G)MSC uses one context with at least two terminations in the CS-MGW. The termination T1 is used towards the 3GPP PLMN and the bearer termination T2 is used for the bearer towards the external IP network.
Figure A.8.1.1.1: H.248 Context Model
A.8.1.2 Signalling flows
The signalling flows in A.7.1.2 apply with the following additions:
– Instead of the procedure Reserve TrGW Connection Point the procedure Reserve RTP Connection Point as defined by TS 23.205 [9] is used.
– Instead of the procedure Reserve and Configure TrGW Connection Point the procedure Reserve and Configure RTP Connection Point as defined by TS 23.205 [9] is used.
– Instead of the procedure Configure TrGW Connection Point the procedure Configure RTP Connection Point as defined by TS 23.205 [9] is used.
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