*** NOTE: DIETS (and the resources at this site) was the initial
prototype of a project that has since moved. The project lives on as
the "ISSI Test Tools (ITT)" component of the P25 Wireline Project on
Java.net. For the current and maintained resources related to this
effort please go to: p25-wireline.dev.java.net ***
One of the the keys to achieving near-term interoperability of P25 Radios is to bridge between potentially non-interoperable RF systems using standard IP-based Protocols. In P25, this bridge is referred to as the Inter-RF Sub-System Interface (ISSI). The ISSI suite comprises protocols that are built on top of Session Initiation Protocol (SIP) for call control signaling and Real-Time Transport Protocol (RTP) to support Push to Talk (PTT).