Description: IETF' s Session Initiation Protocol (SIP), IP network multimedia communication application layer control protocol that can be used to initiate the establishment and release session. Flexible SIP protocol characteristics as well as its flexible and powerful call control functions to attract a growing number of vendors and operators. SIP protocol can also be used in conjunction with the SDP protocol, used to negotiate the session' s media properties, it is easier to achieve third-party call control.
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