I have realized a small Asterisk system with speech to text (Google speech Recognition ) and text to speech (Amazon Polly) capabilities, to help a small call center doing his job.
The System seats behind a NEC pbx, that pass call to Asterisk and then, call could go back.
It happens that on first IVR sometimes DTMF are not recognized.
I have even a voip number to do test and with this no problem.
Has anyone idea how and where to investigate or what to ask for to NEC’s dealer ?