SIP – Session Initiation Protocol

(SIP) Session Initiation Protocol- is a signaling protocol based upon a set of open standards managed by the IETF for Internet conferencing, telephony, and instant messaging. It is a request-response protocol, dealing with requests from clients and responses from servers initiating an interactive user session. Because of the open standards approach SIP devices are generally interoperable between different vendors. In a SIP based VoIP system most of the intelligence is in the IP Phones rather than centrally in the PABX.

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