Session Initiation Protocol
SIP functions by creating session parameters between the participating network termination points. It starts effective communication by authenticating users, finding them, and determining the best mode of contact. Once a media session is established through SIP signaling, data can be transferred between the endpoints without further dependence on SIP. SIP works in conjunction with other systems due to being an application layer protocol and paved the way for new communication models based on the IP platform. It is still rising as enterprise communication technology is shifted from traditional circuit switching to packet switching using IP networks. Thanks to SIP, multi-modal unified communications become possible that were not possible before.
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