Troubleshooting
VoIP Codec Types
The VoIP Help Page Team·1 min read·Last updated: March 14, 2026
**Scope:** The following will help you identify VoIP CODEC types when reading an SDP.
Types
| Type | Name | Bitrate | Packet Size |
|---|---|---|---|
| 0 | PCMU / G.711u | 8khz | 64kpbs |
| 8 | PCMA / G.711a | 8khz | 64kbps |
| 9* | G.722 | 16khz/32khz | |
| 13 | CN / Comfort Noise | 8khz | varies |
| 18 | G.729 | 8khz | 8kbps |
| 96* | Opus | 48khz | varies |
| dynamic | ILBC | 8khz | 13.33 or 15.2kbps |
| 101/126* | telephone-event (DTMF Tone) |
\* These types are dynamic and may be subject to change
The full list as defined by IANA can be found here: https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml#rtp-parameters-1
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