Appendix B SIP Call Flows
Call Flow Scenarios for Successful Calls
Figure B-2 illustrates a successful gateway-to-Cisco SIP IP phone call setup and call hold. In this scenario, the two end users are User A and User B. 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. Gateway 1 is connected to the Cisco SIP IP phone 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 puts User A on hold.
4.User B takes User A off hold.
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