Description: oSIP achieve Session Initiation Protocol Session Initiation (released by the IETF as RFC 3261). It can for multimedia applications (IP phone, etc.) signaling functions. It SIP Grammar providing a complete syntax analyzer can be used to achieve a draft definition of "services" layer. It also provided an SDP analyzer for the user agent and provide the additional functionality. It can be used in the construction of the proxy server and IP Telephony
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