# Dual-tone multi-frequency signaling

> telecommunication signaling system

**Wikidata**: [Q941685](https://www.wikidata.org/wiki/Q941685)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/DTMF_signaling)  
**Source**: https://4ort.xyz/entity/dual-tone-multi-frequency-signaling


## References

1. Freebase Data Dumps. 2013