The irony is that P25 P2, DMR and NXDN use the same AMBE+2 vocoder, just in different ways.
So the DV-1 could be made to acknowledge (as opposed receive/trunk) P25 Phase II, possibly. P25 Remember, Phase II is a trunking platform only. The control channel and non-trunking communications revert back to Phase I.
Also I dare say with a bit of heavy R&D, there is a remote and I underline remote chance it could receive (but not trunk) Phase II somewhat like it currently does DMR. I wouldn't like to put money on it however.