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#multi-frequency_signaling

Multi-frequency signaling

In telephony, multi-frequency signaling (MF) is a type of signaling that was introduced by the Bell System after World War II. It uses a combination of audible tones for address transport and supervision signaling on trunk lines between central offices. The signaling is sent in-band over the same channel as the bearer channel used for voice traffic.

Fri 13th

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Multi-frequency signaling DTMF Signaling (telecommunications) Signaling protocol Telephone keypad Multi-frequency receiver 2600 hertz In-band signaling Plain old telephone service Signalling System R2
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