[Freeswitch-users] In-band vs. Out-of-band DTMF

I'm trying to test DTMF signalling using in-band DTMF. Currently my application monitors the signals via the ESL socket, which works great for out-of-band DTMF. My problem is that when I run my current test using in-band, I'm using a phone line that I know supports out-of band DTMF, so I'm not sure that the data I'm seeing in the ESL socket is out-of-band or in-band. Does anyone know: a) if in-band signalling appears the same across the ESL socket? b) if I should be looking somewhere specific for the in-band signals. c) is there a way to disable out-of-band signalling so I can test only the in-band? Any assistance would be greatly appreciated. Victor