Know Asterisk
is an open source IP PBX.To describe it features it would take a lot of space so I suggest you to go to....
www.asteriskdocs.org
or
www.asteriskguru.com
SIP is an application layer protocol,standardized and mantained by IETF.It is used for transfering multimedia data over an IP network.SIP runs over TCP/UDP ,uses port number 5060,and makes a voip developers life much easier.to know about SIP in detail you may visit.. http://en.wikipedia.org/wiki/Session_Initiation_Protocol I have created this blog to put news and info regarding VOIP (Voice over internet protocol),and SIP. I feel SIP is the future of telephony.
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