ZyXEL Communications P-2612HW-F1 User Manual page 214

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Chapter 10 Voice

The following figure shows the SIP and session traffic flow between the user

agents (UA 1 and UA 2) and the proxy servers (this example shows two proxy

servers, PROXY 1 and PROXY 2).

Figure 120 SIP Call Through Proxy Servers

The following table shows the SIP call progression.

Table 60 SIP Call Progression

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.

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