Had a XTSc, my last one go the other day, need to put in a small SBX on a temporary basis. They have the 30 button uni phones. I know the SBX KSU has to have 4.0 which my spare does but there is a setting somewhere to allow these keysets to be recognized. Does anyone know where to find it? The documentation does not seem to have it. Thanks

The unlock instructions for the 30 button keysets are in the SBX 4.0 manual which is available on Vconnect. You will have to wire the uni-phones to pins three and six on the KSU side.