We have a little problem.
One of our customers has a problem with DTMF pass-thru.
They use GrandStream 286 devices to connect their pstn phones to asterisk.
everything works like a charm, except DTMF pass-thru. when they call an IVR system, they cannot select options because the DTMF tones never reach the IVR.
Normal asterisk voicemail works though. so it looks like asterisk is not forwarding the DTMF tones to the zap interface.
Is this a setup problem or asterisk intended?
Regards.
Andre
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