Incompatible in what sense??
Same DTX was working fine with normal HR and FR as you pointed out earlier.
On the other hand, we have our motorola network which is serving a big city having DTX enabled and AMR working and not a sinle BSCs has DL INTF HOs more than 0.5% while these ALcatel BSCs after implementation of AMR and DTX for AMR are having DL INTF HOs about 5% for each BSC.
SO this degrdation is not there in Motorola Network .
And is it possible through any parametric settings that less weightage is given to measurements while DTX is being used in DL??