Yealink Skype for Business HD IP Phones Administrator Guide
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2. Enter the desired character in the Call Number Filter field.
3. Click Confirm to accept the change.
DTMF
DTMF (Dual Tone Multi-frequency), better known as touch-tone, is used for telecommunication
signaling over analog telephone lines in the voice-frequency band. DTMF is the signal sent from
the Skype for Business phone to the network, which is generated when pressing the Skype for
Business phone’s keypad during a call. Each key pressed on the Skype for Business phone
generates one sinusoidal tone of two frequencies. One is generated from a high frequency
group and the other from a low frequency group.
The DTMF keypad is laid out in a 4×4 matrix, with each row representing a low frequency, and
each column representing a high frequency. Pressing a digit key (such as '1') will generate a
sinusoidal tone for each of two frequencies (697 and 1209 hertz (Hz)).
DTMF Keypad Frequencies:
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