I'm rather new to headsets and such -- but we have a R-Columbia intercom headset (we use it on a Clear-Com wired system) whose connector has come off. The wires are red, white, black, and bare; and the terminals are marked 1 through 4. (I don't know the terminology for the connector type, but it's about a 5/8-in. cylindrical form with four pin-sockets.) Does anyone know which wires go to which terminals? (I've tried to go to rcolumbia.com and tried their phone number -- out of service, both. Have they gone out of business?)