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We distinguish 3 types of key sound features:

DTMF tones during call initiation (dialing)

Hearing DTMF tones during call initiation (dialing) is enabled only for some tone schemes (due to each country's ISDN standardization).

Here is the list of the tone schemes this feature will affect:
  • Australia
  • China
  • Denmark
  • Great Britain
  • India
  • Italy
  • Japan
  • Mexico
  • Netherlands
  • New Zealand
  • United States

Some customers asked to be able to disable these tones when in speaker mode, for privacy reasons. You can disable them by turning dtmf_speaker_phone to off. Please note that this setting has no effect on handset/headset mode.

Note: In firmware versions < 8.4.35, the 8xx series plays no DTMF tones in handsfree mode when a number is dialed.

DTMF tones when the phone is in a call

During a call the DTMF echo is always audible.


It is important to understand that the keytones are not DTMF. This is an obsolete feature, which was used in the past when the snom phone keys were made of rubber. It was used to give the user a small audible feedback when pressing a key. In the present, the snom keys are made of plastic, so this sound is there naturally and does not need to be created artificially by the phone. However, the feature still works and can be enabled using the keytones setting.

Note: the audible feedback only works for the keys which are not the numbers, * or # keys .

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