Template:SIP TEST FACT DTMF

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The provider does not fully support reliable transportation of DTMF signals (DTMF tones are treated separately from voice data). There may be different symptoms like

  • no DTMF at all
  • no DTMF at the beginning of a call
  • loss of some DTMF digits in a multi-digit DTMF sequence
  • duplication of DTMF digits
  • DTMF digits echoed back to the sender
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