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Message Session Relay Protocol: Wikis


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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 Initiation Protocol (SIP) or other rendez-vous 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 Image Sharing features.



For example, MSRP can be used within a SIP session:

  • to do Instant Messaging in a one-to-one or one-to-many mode
  • to transfer file attachment
  • to do some Image Sharing based on prior exchange of capabilities between the user endpoints

Clients and Servers


  1. ^ RFC 4975, The Message Session Relay Protocol (MSRP), B. Campbell (Ed.), R. Mahy (Ed.), C. Jennings (Ed.), The Internet Society (September 2007)
  2. ^ 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)

See also


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