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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