Enhancements to RTP Format for EVRC Family Codecs

Document Type Replaced Internet-Draft (individual)
Last updated 2009-02-24 (latest revision 2005-09-26)
Replaced by RFC 4788
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document defines several enhancements and extensions to RFC3558 EVRC RTP payload format. In particular, it defines the support for a compact bundled format and EVRC-B codec, as well as discontinuous transmission (DTX) support for EVRC and EVRC-B encoded speech transported via RTP sessions. Some VoIP applications, such as Push- to-Talk and VoIP over low bandwidth dial-up and wireless networks, require such enhancements for efficient use of the bandwidth.


Rohit Kapoor (rkapoor@qualcomm.com)
Qiaobing Xie (qxie1@email.mot.com)

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