> What is RTP?

Sending Voice over IP (VoIP) requires two protocols: SIP and RTP (Real-time Transport Protocol).

  • SIP – Protocol used for establishing a session (call). IP address and port information are exchanged.
  • RTP – After SIP establishes a session, this protocol is used for exchanging voice packets.
You can think of SIP as a stage manager. SIP prepares the stage for RTP by setting up its connection. Once RTP is finished with its stage (call), then SIP comes back to the stage to clean up after it. 

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