RFC 3389 · PROPOSED STANDARD · 2002
SUN · 14 JUN 2026
Real-time Transport Protocol Payload for Comfort Noise
Overview
RFC 3389, “Real-time Transport Protocol Payload for Comfort Noise”, is a Proposed Standard document published in October 2002 by R. Zopf. The canonical text is published by the RFC Editor.
Abstract
This document describes an RTP [2] payload format for transporting comfort noise (CN). The CN payload type is primarily for use with audio codecs that do not support comfort noise as part of the codec itself such as ITU-T Recommendations G.711 [3], G.726 [4], G.727 [5], G.728 [6], and G.722 [7].
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
Read this RFC
The canonical text of RFC 3389 is hosted at rfc-editor.org. Available in TXT,HTML.
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