The NX-5000 Series supports 2 digital CAIs - P25 (Phases 1 & 2) and NXDN™ - plus FM analog in a single radio. Unsurpassed interoperability is in your hands. A desired CAI can be selected at will - whether you are intent on going fully digital, undecided about which digital system to pick, or just wanting to maintain both digital and analog for a while. P25 is a digital CAI to ensure interoperability among public safety agencies. The NX-5000 Series is compatible with Phase 1 (conventional and trunked), and Phase 2 (trunked).