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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