The IDA Corp. EASY-LINK RF/IP is a controller using VOICE over IP technology to provide single-user linking between two different radio systems. Using a pair of EASY-LINK RF/IP eliminates the need for phone lines or microwave. For linking between LTR systems, the EASY-LINK RF/IP uses the control station frequencies for the SMR sites being linked. Cross-band linking between other systems uses the frequencies already in use by the other systems, so additional linking frequencies are not needed. Once the installation is complete, an EASY-LINK RF/IP will communicate with another EASY-LINK RF/IP via Ethernet TCP/IP and UDP protocol. The two EASY-LINK RF/IP units along with Static IP addresses allow two radios to be remotely connected providing bi-directional operation. Operation is also completely transparent to the end user with virtually no audio loss or degradation. No DTMF microphones, special signaling methods or other complicated procedures are needed in order to establish a path between EASY-LINK RF/IP's.