ZyXEL VMG3927-B50B User Guide - Page 232
User Agent 1, Proxy 1, User Agent 2, Proxy 2, PROXY 1, PROXY 2
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Page 232 highlights
Chapter 21 Voice Figure 139 SIP Call Through Proxy Servers DSL DSL The following table shows the SIP call progression. Table 103 SIP Call Progression UA 1 PROXY 1 Invite Invite 100 Trying ACK RTP 200 OK 180 Ringing 200 OK PROXY 2 Invite 100 Trying 180 Ringing 200 OK UA 2 180 Ringing 200 OK RTP BYE 1 User Agent 1 sends a SIP INVITE request to Proxy 1. This message is an invitation to User Agent 2 to participate in a SIP telephone call. Proxy 1 sends a response indicating that it is trying to complete the request. 2 Proxy 1 sends a SIP INVITE request to Proxy 2. Proxy 2 sends a response indicating that it is trying to complete the request. 3 Proxy 2 sends a SIP INVITE request to User Agent 2. 4 User Agent 2 sends a response back to Proxy 2 indicating that the phone is ringing. The response is relayed back to User Agent 1 via Proxy 1. VMG4927-B50A / VMG9827-B50A / VMG3927-B50B User's Guide 232
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