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WHAT IS (DTMF) DUAL TONE MULTI-FREQUENCY ?
 
   

DTMF (dual tone multi-frequency) dialing, is more commonly known as 'tone' dialing and sometimes referred to as 'VF' (voice frequency) dialing. It is achieved by the transmission of a combination of two pure frequency tones (from a selection of 7 tones generated within the telephone) which uniquely identify the particular key pushed.

 

Tone dialing is speedy and enables the transmission of two additional 'digits', which are ( * = star) and ( # = hash), which are generally used as 'control' digits for such facilities as voice mail and home banking.

Exchanges that support tone dialing will also support pulse dialing, so it is possible to have both tone dialing and pulse dialing telephones to the same line however, pulse dialing is now being made obsolete.

This page was last modified on 19 January 2010 and maybe out of date with regards to newer practices at the time of reading this article

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