# DTMF Mode

The DTMF mode is a setting that governs how [Dual Tone Multi Frequency](/glossary/d/dtmf) signalling is to be performed.

^ Mode ^ Description ^
| Compatibility | Use RFC2833 by default but switch to inband when reciever does not support RFC2833. |
| RFC2833 | Send DTMF information as [RTP](/glossary/r/rtp) messages. |
| SIP INFO | Send DTMF information as [SIP](/glossary/s/sip) messages. |
| Inband | DTMF tones are generated by the calling device. |