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