Wednesday, October 20, 2010

Voice over IP, TAPI, SIP protocols

Voice over IP is a suite of related protocols working together to carry media (voice and others as well -- video) over a packet-switched network such as the Internet (based on IP protocol).

For example, you may write some code to sample data from a microphone and send over the net using UDP and that's VoIP. Or you may use more appropriate protocols such as RTP, RSTP, etc.

To learn VOIP, try to study TAPI (Telephonic Application Programming Interface).You can make SIP proxy server in any High Level language (one I know is VC++) and use it for VoIP features. see help for the following in MSDN

•    TAPI
•    SIP (session initiation protocol)
•    H.323 protocol.

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