The new Astro 25 Trunked Intergrated Voice and Data system from Motorola Inc. is the latest project 25 complaint system offering. This system release features Integrated Voice and Data capabilities, providing the public safety market with access to both voice and data messaging from a single wireless communications infrastructure. The new ASTRO 25 Trunking system improves communications security by providing encryption key assignment over system radio channels (Over the Air Re-keying) and enhanced network security tools. The modular design of the ASTRO 25 system provides scalability in handling the needs of small or large communications systems. In addition, the flexible system design includes narrowband simulcast in the 12.5 kHz range. This feature provides improved portable coverage in densely populated urban areas as well as critical in-building coverage.