ZyXEL V630 User Guide - Page 129
SIP Proxy Server, SIP Redirect Server,
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Figure 128 SIP User Agent Chapter 14 SIP Account Setup 14.1.4.2 SIP Proxy Server A SIP proxy server receives requests from clients and forwards them to another server. In the following example, you want to use client device A to call someone who is using client device C. 1 The client device (A in the figure) sends a call invitation to the SIP proxy server (B). 2 The SIP proxy server forwards the call invitation to C. Figure 129 SIP Proxy Server 14.1.4.3 SIP Redirect Server A SIP redirect server accepts SIP requests, translates the destination address to an IP address and sends the translated IP address back to the device that sent the request. Then the client device that originally sent the request can send requests to the IP address that it received back from the redirect server. Redirect servers do not initiate SIP requests. In the following example, you want to use client device A to call someone who is using client device C. 1 Client device A sends a call invitation for C to the SIP redirect server (B). 2 The SIP redirect server sends the invitation back to A with C's IP address (or domain name). 3 Client device A then sends the call invitation to client device C. V630 User's Guide 129