Guide to Cisco Systems' VoIP Infrastructure Solution for SIP - Chap 7: SIP Call Flow Process for the
SIP Gateway-to-SIP Gateway—Call Setup and Disconnect Figure 7-1 illustrates a successful gateway-to-gateway call setup and disconnect. In this call flow scenario, the two end users are User A and User B. User A is located at PBX A. PBX A is connected to S...