Zyxel-communications 802.11g Wireless ADSL2+ 4-port VoIP IAD P-2602HWNL Uživatelský manuál stáhnout pdf (Strana 167)

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P-2602HWNLI User’s Guide

Chapter 11 Voice 167

11.2.3.1 SIP User Agent

A SIP user agent can make and receive VoIP telephone calls. This means that SIP can be used

for peer-to-peer communications even though it is a client-server protocol. In the following

figure, either A or B can act as a SIP user agent client to initiate a call. A and B can also both

act as a SIP user agent to receive the call.

Figure 89 SIP User Agent

11.2.3.2 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.

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