P25 radios have four main objectives they must abide by. First, they ensure competition in system life cycle procurements through Open System Architecture. Second, P25 radios allow effective, efficient and reliable intra-agency and interagency communications. Third, project 25 portable radios provide enhanced functionality and capabilities with a focus on public safety needs. Finally, project 25 improves radio spectrum efficiency.
The suite of standards for a Project 25 radio specifies eight open interfaces for LMR systems. This includes Common Air Interface (CAI), Subscriber Data Peripheral Interface, Fixed Station Interface, Console Subsystem Interface, Network Management Interface, Data Network Interface, Telephone Interconnect Interface, Inter RF Subsystem Interface. Emergency personnel are able to choose from each of these interfaces so they get the radio specific to their needs.