Description: called SIP Session Initiation Protocol (Session Initiation Protocol l). SIP is the Internet Engineering Task Force (IETF), the recommendations of an agreement, its purpose is to replace the H.323 part of the agreement is mainly on account of the next generation network (NGN), As IP and IP gateways in the network will be large-scale use and integration, making end-to-end IP can be applied to achieve a pure IP business applications; For pure IP SIP from the HTTP and SMTP, simple structure and is designed to be scalable and scalability. In addition, the SIP also provides good QoS support. IP NGN for the realization of the VoIP network and multimedia communications speaking, SIP to meet the full requirements of the characteristics of NGN application has unique advantages, the next generation w
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