In computer networking, the Message Session Relay Protocol (MSRP) is a protocol for transmitting a series of related instant messages in the context of a communications session. An application instantiates the session with the Session Description Protocol (SDP) over Session Initiation Protocol (SIP) or other rendezvous methods.
The MSRP protocol is defined in RFC 4975.[1] MSRP messages can also be transmitted by using intermediaries peers, by using the relay extensions defined in RFC 4976.[2]
MSRP is used in the RCS context, especially for the instant messaging, file transfer and photo sharing features.
^RFC 4975, The Message Session Relay Protocol (MSRP), B. Campbell (Ed.), R. Mahy (Ed.), C. Jennings (Ed.), The Internet Society (September 2007)
^RFC 4976, Relay Extensions for the Message Session Relay Protocol (MSRP), C. Jennings (Ed.), R. Mahy (Ed.), A. B. Roach (Ed.), The Internet Society (September 2007)
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