For the love of the the radio gods the XG100M supports the following.
Digital Voice
P25 conventional. P25 Phase 1 Trunking, P25 Phase 2 Trunking each requires a specific feature code. The radio supports these in either the CH100 Touchscreen, CH721 or CH731 HHCH configuration. The radio also supports DES and AES encryption and ARC40 (ADP)
ONLY with the CH721 or CH731 will the radio ADDITIONALLY support legacy EDACS, PROVOICE (proprietary IMBE vocoder) or very old school VGE digital voice encryption over analog). If you use the CH100 control head you LOSE EDACS and PROVOICE.
THERE ARE NO OTHER COMPETITOR DIGITAL VOICE STANDARDS SUPPORTED - NONE NADDA ZIP. NO NXDN, NO ETSI DMR, NO ANALOG Trunking.
NO the radio does not support OPENSKY
Further, the XG100P (legacy, ancient and discontinued) has NOTHING in common with the XG100M (still current for specific contracts) other than a slightly similar GUI interface. The radios share ZERO HARDWARE.