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Telephony Tones Using MIDI in SIP

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Cullen Fluffy Jennings , David A. Bryan
Last updated 2007-06-04
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This document describes conventions for using MIDI to generate tones on SIP UAs. This does not define any changes to SIP but describes how to use the existing Alert-Info header to play tones that can be used to indicate specialized PSTN tones such as the ringback tones from various countries. The tones are described using MIDI which results in a compact representation that is simple for a UA to generate and easy to render into audio. This work is being discussed on the mailing list. This draft was revived at request of a few people so it could be discussed. Parts of it need to be updated since it was written in 2003.


Cullen Fluffy Jennings
David A. Bryan

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