DIDWW servers send DTMF packets with a different duration than is set in NMS Communication software (e.g.: 160 instead of 0 and 1440 instead of 800).
At the NMS you should set that all durations will be accepted.
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KB » Troubleshooting» DTMF
KB » Troubleshooting» DTMF

I Cannot Receive DTMF Packets, Using NMS Communication Software