In the world of telecommunications, SIP is a buzzword used by many but often misunderstood. SIP stands for Session Initiation Protocol and is defined in RFC 3261. SIP is a signaling protocol designed to set up, tear down and modify phone calls on modern VoIP networks. To be clear, SIP is not what transports the actual audio stream for a phone call; that transport is provided by the RTP (Real-time Transport Protocol) in a modern VoIP network and will be addressed in a later blog post.
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