THE SESSION INITIATION PROTOCOL
What is SIP?
SIP is a deceptively simple protocol for setting up and controlling sessions between endpoints.
The "sessions" are commonly telephone calls. The "endpoints" are usually IP phones or adapters.
"Sessions" can include many other services, from conferencing and video calls to instant messaging.
"Endpoints" often include gateways to the PSTN.
SIP allows the endpoint, such as an IP phone, to have a flexible level of "intelligence". The endpoint
might be a "dumb phone", or it might be a full-featured multi-line deskset integrated with a Microsoft Outlook®
contact manager for point-and-click dialing, and with enterprise-wide presence indication.
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