Quote Originally Posted by dswartz View Post
Confused about something here. If the false tones happen because the ATA hears a sound from the other end that it mistakes for a DTMF tone, why would making the setting "Inband" fix it? If the ATA is doing RFC2833, why would this ever happen, since it would not be looking for DTMF tones in the inbound audio stream? Obviously, I am misunderstanding something here...
It doesn't make complete sense to me either (or I'm misunderstanding it) but check around on Google and there are tons of PAP2 situations where changing it to inband fixes completely with a bunch of different providers.

I think it's some kind of bug they have, but it happens with so few people they refuse to look at it.

Whenever we've had reports of it, that almost always fixes it.