Raytheon Company (NYSE:RTN) will demonstrate the new ISSI capability of its INTEROP-7000™ Interoperability Gateway at the International Wireless Communications Expo inLas Vegas. The P25 ISSI (Inter RF Subsystem Interface) adds another dimension to Raytheon's interoperability gateways that allow police, fire and rescue personnel on disparate radios to communicate with one another using their current equipment.