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The Bell MF tone receiver module provides for the detection of the repertoire of 15 dual tones needs for various Bell MF signalling protocols. It is compliant with ITU-T Q.320, ITU-T Q.322, ITU-T Q.323B.
Basic Bell MF tone detection specs:
Note: Above -3dBm the signal starts to clip. We can detect with a little clipping, but not up to 0dBm, which the above spec seems to require. There isn't a lot we can do about that. Is the spec. incorrectly worded about the dBm0 reference point, or have I misunderstood it?