RFC 7587: RTP Payload Format for the Opus Speech and Audio Codec

Publisher

IETF / RFC Editor

URL

https://www.rfc-editor.org/rfc/rfc7587.html

Published

2015-06-01

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

IETF Trust Legal Provisions (BCP 78); IETF text may be excerpted with attribution; short excerpts and locators only

Source notes citing this source

• If no ptime is signalled for Opus, the default packetization is 20 ms. in context
• RFC 7587 recommends Opus bitrates, at 20 ms frames, of 8-12 kbit/s for narrowband speech, 16-20 kbit/s for wideband speech and 28-40 kbit/s for fullband speech. in context
• The Opus RTP timestamp always runs on a 48000 Hz clock, whatever the Opus mode or the audio's actual sampling rate. in context
• The Opus media type defines receiver-side SDP parameters that affect bandwidth: maxaveragebitrate (maximum average receive bitrate in bit/s), maxplaybackrate, usedtx (default 0), cbr (default 0, meaning variable bitrate) and useinbandfec. in context
• In SDP, Opus is signalled with the encoding name 'opus/48000/2' (48000 clock rate, 2 channels), even for mono streams. in context

Cite this source record

APA

WarmTransfer. (2015, June 1). RFC 7587: RTP Payload Format for the Opus Speech and Audio Codec. WarmTransfer. https://warmtransfer.net/knowledge/sources/rfc-7587-opus-rtp-payload

BibTeX

@misc{warmtransfer-rfc-7587-opus-rtp-payload,
  title  = {RFC 7587: RTP Payload Format for the Opus Speech and Audio Codec},
  author = {{WarmTransfer}},
  year   = {2015},
  url    = {https://warmtransfer.net/knowledge/sources/rfc-7587-opus-rtp-payload},
  note   = {IETF / RFC Editor, accessed 2026-09-24}
}