Two radios can be connected back-to-back over an IP link. This can typically be used to interconnect two repeater sites over a Wide Area Network. PTT and COS signals are transported over the link as data messages. The IPR 100 will provide a configurable PTT output to the radio. It will also accept a configurable COS input from the radio. An active COS signal from the radio will enable the transmission of voice packets over the IP network and generate a PTT output at the opposite end. Full duplex operation is supported.