What is SIP (Session Initiation Protocol)?
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Session Initiation Protocol (SIP) is a signaling protocol used for initiating, maintaining, modifying and terminating real-time sessions that involve video, voice, messaging and other communications applications and services between two or more endpoints on IP networks. SIP is a text-based protocol, similar to HTTP and SMTP, that is designed to support a wide range of applications and services, including voice and video calling, messaging, and presence.

SIP is used to establish, modify, and terminate two-party or multi-party sessions. It can be used to initiate and control various types of media sessions, such as voice and video calls, as well as multimedia conferences. SIP is designed to be independent of the underlying transport layer and can be used with a variety of transport protocols, including UDP, TCP, and TLS.

SIP is an important protocol in the field of communication and is widely used in the implementation of VoIP (Voice over Internet Protocol) systems. It is a key component of many modern communication systems, including IP PBXs, VoIP gateways, and hosted PBX services.

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