SCC, when acting in its primary capacity as the relay center for radio communications between Department Units, receives the message for transmission from the Station of jurisdiction via the Mobile Digital Communications System, MDCS. The exact message is then relayed over one of several frequencies to the concerned mobile Unit.
In this capacity, SCC does not dispatch, command or control the Unit's communication, but merely relays the communication.
There is a direct voice channel "Hot Line" between each Station and the Sheriff's dispatcher assigned to that Station. An alternate voice line that can be used as a backup to the Hot Line is an automatic ring circuit "Cold Line." When the Cold Line rings at SCC, it is answered by a communication operator.