A Framework for SDP Attributes when Multiplexing

Document Type Replaced Internet-Draft (individual)
Author Suhas Nandakumar 
Last updated 2013-10-20
Replaced by RFC 8859
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The Session Description Protocol (SDP) provides mechanisms to describe attributes of multimedia sessions and of individual media streams (e.g., Real-time Transport Protocol (RTP) sessions) within a multimedia session. In the RTCWeb WG, there is a need to use a single 5-tuple for sending and receiving media associated with multiple media descriptions ("m=" lines). Such a requirement has raised concerns over the semantic implications of the SDP attributes associated with the RTP Sessions multiplexed over a single transport layer flow. The scope of this specification is to provide a framework for analyzing the multiplexing characteristics of SDP attributes. The specification also categorizes existing attributes based on the framework described herein.


Suhas Nandakumar (snandaku@cisco.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)