Interoperability refers to a variety of scenarios including:
■ Multiple vendors’ radios working together
■ Multiple agencies working together, for example Police, Fire and EMS at an incident scene
■ Neighboring statewide networks working together

Fair use excerpt from the Motorola Publication: INTEROPERABILITY PLANNING FOR  PUBLIC SAFETY CONSIDERATIONS FOR EFFECTIVE JOINT EMERGENCY COMMUNICATIONS

EMR-NYC is prepared to support other agencies on Level 1, 2, and 3