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Message Session Relay Protocol
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<p>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 <a href="/facts/Session_Description_Protocol/WMnnA5jb">Session Description Protocol</a> (SDP) over <a href="/facts/Session_Initiation_Protocol/cbjUoNqP">Session Initiation Protocol</a> (SIP) or other <a href="/facts/Rendezvous_protocol/kD6BkTWu">rendezvous</a> methods. </p><p>The MSRP protocol is defined in <a href="http://www.rfcreader.com/#rfc4975">RFC 4975</a>. MSRP messages can also be transmitted by using intermediaries peers, by using the relay extensions defined in <a href="http://www.rfcreader.com/#rfc4976">RFC 4976</a>. </p><p>MSRP is used in the <a href="/facts/Rich_Communication_Services/sI5UAdvy">RCS</a> context, especially for the <a href="/facts/Instant_messaging/8lwwDyjK">instant messaging</a>, <a href="/facts/File_transfer/9qP8HDW8">file transfer</a> and <a href="/facts/Photo_sharing/pyJS36yM">photo sharing</a> features. </p>