Real-Time Transport Protocol (RTP) Payload and File Storage Formats for the Variable-Rate Multimode Wideband (VMR-WB) Audio Codec

Document Type Replaced Internet-Draft (individual)
Author Sassan Ahmadi 
Last updated 2009-02-24 (latest revision 2004-06-24)
Replaced by RFC 4348
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Expired & archived
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IESG IESG state Replaced by draft-ietf-avt-rtp-vmr-wb
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document specifies a real-time transport protocol (RTP) payload format to be used for the Variable-Rate Multimode Wideband (VMR-WB) speech codec. The payload format is designed to be able to interoperate with existing VMR-WB transport formats on non-IP networks. In addition, a file format is specified for transport of VMR-WB speech data in storage mode applications such as email. A MIME type registration is included, for VMR-WB, specifying use of both the RTP payload and the storage formats that has a number of operating modes, one of which is interoperable with AMR-WB (i.e., RFC 3267) audio codec at certain rates. Therefore, provisions have been made in this draft to facilitate and simplify data packet exchange between VMR-WB and AMR-WB in the interoperable mode with no transcoding function involved.


Sassan Ahmadi (

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