A SIP Server is the main component of an IP PBX, and it is responsible mainly
for the setup of all calls in the network. SIP server is also known as SIP Proxy.
Although a SIP server is the most important part of the SIP based phone system,
it only handles the setup and teardown of calls. It does not transmit or receive
any kind of audio. The Mediaserver does it in RTP.
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