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DOI: https://doi.org/10.17487/RFC4976
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Two separate models for conveying instant messages have been defined.Page-mode messages stand alone and are not part of a SessionInitiation Protocol (SIP) session, whereas session-mode messages are setup as part of a session using SIP. The Message Session Relay Protocol(MSRP) is a protocol for near real-time, peer-to-peer exchanges ofbinary content without intermediaries, which is designed to besignaled using a separate rendezvous protocol such as SIP. Thisdocument introduces the notion of message relay intermediaries to MSRPand describes the extensions necessary to use them. [STANDARDS-TRACK]
For the definition ofStatus,seeRFC 2026.
For the definition ofStream, seeRFC 8729.