Working Groups are the primary mechanism for development of IETF specifications and guidelines. RTCP port numbers were necessarily derived from the base media port in older versions of RTP (such as []), but now that this restriction has been lifted, there is a need to specify RTCP ports explicitly in SDP. RFC 3605 RTCP attribute in SDP October 2003 states that "other ports used by the media application (such as the RTCP port) should be derived algorithmically from the base media port." Working Groups Request for Comments (RFC s) Working groups. This document specifies how the UDP Transport Layer (UDPTL) protocol, the predominant transport protocol for T.38 fax, can be transported over the Datagram Transport Layer Security (DTLS) protocol, how the usage of UDPTL over DTLS is indicated in the Session Description Protocol (SDP), and how UDPTL over DTLS is negotiated in a session established using the Session Initiation Protocol (SIP).

Internet Engineering Task Force (IETF) F. Andreasen Request for Comments: 5898 Cisco Systems Category: Standards Track G. Camarillo ISSN: 2070-1721 Ericsson D. Oran D. Wing Cisco Systems July 2010 Connectivity Preconditions for Session Description Protocol (SDP) Media Streams Abstract This document defines a new connectivity precondition for the Session Description Protocol (SDP) … 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.

Other actions: View Errata | Submit Errata | Find IPR Disclosures from the IETF. Understanding the Internet Engineering Task Force.

RFC 2327, RFC 3266 Authors: M. Handley V. Jacobson C. Perkins Stream: IETF Source: mmusic . The offerer can either describe the files it wants to send, or the files it would like to receive. The Session Description Protocol (SDP) was intended to describe multimedia sessions for the purposes of session announcement, session invitation, and other forms of multimedia session initiation. DOI: 10.17487/RFC4566 Discuss this RFC: Send questions or comments to mmusic@ietf.org. Cite this RFC: TXT | XML.

SDP is extended to describe the attributes of the files to be transferred. Abstract.