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Digital/TEC definition
of
Dual Tone Multi Frequency
![Tunstall](https://static.wixstatic.com/media/0b12bc_249fe196dec5498780c26fc2309dbf80~mv2.png/v1/fill/w_81,h_81,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/_edited_edited.png)
from
Tunstall Healthcare (UK) Ltd
These are the tones that are heard when buttons on a telephone are dialled. These tones are used by telephone networks to send messages over a telephone connection. They are also used by devices such as fax machines, care alarms, burglar alarms and textphones to communicate over ordinary telephone lines. Tunstall's proprietary alarm protocols TTNew/TT92/TT21 all use DTMF as a means of signalling. DTMF specifically sends messages in pairs of tones that are transmitted simultaneously. By comparison, STMF transmits single tones at any one time, this tends to provide a more reliable transmission compared to DTMF. STMF is a proprietary Tunstall technology.
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