Conventions for the use of the Session Description Protocol (SDP)for Digital Circuit Connections

Document Type Expired Internet-Draft (individual)
Author Tom Taylor 
Last updated 2002-04-08
Stream (None)
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes conventions for using the Session Description Protocol (SDP) for controlling digital circuits. These conventions describe - circuit addressing conventions for use on the SDP 'c=' line - content of the 'm=' line(s) for digital circuits - attributes to convey the parameters contained within the Bearer Capability, Low Layer Compatibility, and High Layer Compatibility Information Elements of ITU-T Recommendation Q.931. These conventions have been defined for use in media gateway control, particularly in support of NAS operation, but may also be used by IP-based call signalling schemes (SIP, BICC) to control media exchange over digital circuits.


Tom Taylor (

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