Now widely accepted VoIP control signaling system including the ITU - T h. 323 standard and IETF SIP protocol, the implementation of signal control function is the same, but different design and implementation method, based on the two different standards caused a VoIP two major development direction, for example, in Windows built-in NetMeeting, is a typical use of h. 323 protocol client, and more often see the SIP system include Microsoft MSNMessenger,
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