DTMF

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If you make a phone call with text recording and it does not recognise the pressed number, the DTMF function is not activated. You need to search this on the manual of your VoIP device. On the FRITZ!Box you will find this for example on "Internet Telephony" - "Internet Phone Numbers" - "DTMF-Transmission: RTP or Inband".

EN dritzboxdtmf.png