[Asterisk-Users] Dialling Problem

[Mohammad Salaque]

Dear List,
I am facing another strange problem . some of my envisions like to use
other prepaid card (whatever they found in market)  but when they dial
that access number (phone number to put the pin) they get IVR (Please
provide your pin number ) but when my user press pin its not going
through, that IVR even can't get wrong pin number . just get
disconnected as no pin number provided.

what could be the problem ?

thanks
Salaque