The core SIP specification defines six types of SIP requests, each of them with a different purpose. Every SIP request contains a field, called a method, which denotes its purpose. The list shows the six methods
1. Session initiation protocol(SIP).
*invite.
*ack.
*options.
*bye.
*cancel.
*register.
2.Real transport protocol.
Real-time Transport Protocol (RTP), which provides end-to-end delivery services for data with real-time characteristics, such as interactive audio and video. Services include payload type identification, sequence numbering, time stamping and delivery monitoring.
3.RTCP:
Real-time Transport Control Protocol (RTCP) is the optional companion protocol to RTP; it is not needed for RTP to work. The primary function of RTCP is to provide feedback on the quality of the data distribution being accomplished by RTP.
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