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Reference > Libraries > Mkrgsm > Voice.writedtmf

MKRGSM - voice.writeDTMF()

Description

Send a DTMF tone over the voice call. A voice call must be active

Syntax


voice.writeDTMF(charToSend)

Parameters

charToSend: the DTMF tone to send. Valid options are:

  • numbers from 0 to 9
  • *
  • #
  • letters from A to D

Returns

1 for success, 0 for failure