H. 323 recommendation is a comparatively complete proposal, which provides a concentrated treatment and management of the work mode, this way of working mode and telecommunication network management is adapted, especially suitable for the phone to the IP telephone network building, theory and practice show that h. 323 IP phone system has the ability to make any size, SIP protocol is put forward another set of IP telephone system structure, is a with h. 323 tied for the agreement, the SIP protocol has a simple, good extensibility and closely the characteristics of the existing Internet applications,

The starting point of the SIP protocol is wants to frame on the basis of the existing Internet IP telephony network,
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