Session Description Protocol (SDP) Offer/Answer Mechanism to Enable File Transfer

Document Type Replaced Internet-Draft (individual)
Last updated 2008-04-16 (latest revision 2006-12-04)
Replaced by RFC 5547
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document provides a mechanism to negotiate the transfer of one or more files between two endpoints by using the Session Description Protocol (SDP) offer/answer model specified in RFC 3264. SDP is extended to describe the attributes of the files to be transferred. The offerer can either describe the files it wants to send, or the files it would like to receive. The answerer can either accept or reject the offer separately for each individual file . The transfer of one or more files is initiated after a successful negotiation. The Message Session Relay Protocol (MSRP) is defined as the default mechanism to actually carry the files between the endpoints. The conventions on how to use MSRP for file transfer are also provided in this document.


Miguel GarcĂ­a (

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