P25 ISSI Test Tool Downloads

On behalf of DHS/OIC (Department of Homeland Security/Office for Interoperability and Compatibility), the PSCR (Public Safety Communications Research) program is working to support the emergency response community and industry in their effort to accelerate the development of P25 (Project 25) standards for interoperable communications.

One of the keys to achieving near-term interoperability of P25 radios is to bridge between potentially non-interoperable RF (radio frequency) systems using standard IP (Internet Protocol)-based protocols. In P25, this bridge is referred to as the ISSI (Inter-RF Subsystem Interface). The ISSI suite comprises protocols that are built on top of SIP (Session Initiation Protocol) for call control signaling and RTP (Real-Time Transport Protocol) to support PTT (push-to-talk).

To test and measure ISSI equipment and infrastructure, we are developing the ITT (Inter-RF Subsystem Interface Test Tool), which serves as an ISSI reference implementation and an ISSI test and evaluation framework.

Download ITT

ITT is available free of charge. Download ITT at java.net.