What is DTMF?

The tones a phone sends when you press a key.

Dual-Tone Multi-Frequency signalling is what a phone transmits when a key is pressed — each key sends two simultaneous tones that the receiving system decodes. It is how IVR menus read keypresses, and how callers enter account numbers and PINs.

This is an industry glossary. A term defined here is not a statement that Drop AI provides it — see the pricing page for what is included.