Appendix B SIP Call Flows
Call Flow Scenarios for Successful Calls
Gateway
Figure B-3 illustrates a successful gateway-to-Cisco SIP IP phone PC call setup and call transfer without consultation. In this scenario, there are three end users: User A, User B, and User C. User A is located at PBX A. PBX A is connected to Gateway 1 (SIP Gateway) via a T1/E1. User B is located at a Cisco SIP IP phone and is directly connected to the IP network. User C is located at PBX B. PBX B is connected to Gateway 2 (SIP Gateway) via a T1/E1. Gateway 1, Gateway 2, and the Cisco SIP IP phone are connected to one another over an IP network.
The call flow is as follows:
1.User A calls User B.
2.User B answers the call.
3.User B transfers User A’s call to User C and then hangs up.
4.User C answers the call.
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