Softswitch technology as a prelude to the next generation network has played in the systems, several countries, including China, carrier is the soft exchange system to test and SIP in each operators, equipment manufacturers are under the impetus of the rapid development, zte, and some of his rivals on their products also support SIP, in today's user needs diversification, operators needed this softswitch network architecture to deploy its own network, at the same time also need to SIP such an agreement to support user personalized service, believe that with the mature of softswitch products, SIP will become the mainstream communication protocol

From a general point of view, the SIP role during a session is with other agreements, such as No. 7 signalling, h. 323 protocol is the same, complete is a signaling in place, but as a result of the SIP itself characteristic, and based on softswitch represents the emergence of softswitch network, to get the SIP
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