We have PSTN lines connected to FXO lines of a TDM400B. I just got a
complaint that overseas callers who are using cellphones sometimes find
that DTMF digits aren't working - they press digits and the menu goes on
as if they hadn't pressed anything. Since it sometimes works, and other
IVRs work over the same cellphones, it's not that the cellphone isn't
sending the digits. I asked if they had similar problems from landlines
overseas and they did not.
Any ideas? If I play around with rxgain could I overload something for
callers who don't currently have any problems?
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