rex,
you should disable DL_DTX_AMR parameters (only the AMR related ones, not the “legacy” DTX), as long as there is a problem. I’m surprised that the issue arises with Nokia MS only. The problem comes from the BSS
If your qual HO increases, then the other solution is to disable AMR, in order to all DL DTX for all calls. (that’s probably what I would do 🙂 wait for B11 AMR)
Regards