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Appendix A: Basic call flows
Using SIP as the signaling protocol to establish a communication path between endpoints, the SIP Application Module provides the following call services:
•Voice plus video
•Call transfer
•Authentication
The following sections provide sample diagrams and descriptions of the call flows that enable these specific services. For an overview of a basic call flow, see the MCP Basics document.
Voice plus video
Figure 1, “Client-to-client voice plus video diagram,”and Figure 2, “Client-to-client voice plus video callflow,” show the basic call flow for
aclient-to-client voice-plus-video call. Each client in the diagram has a User Agent. The SIP Application Module provides Back-to-Back User Agent service, treating each SIP call as an independent Ingress and Egress leg. A detailed, step-by-step illustration follows this diagram.
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