Can anyone help out??? I work on an OPtion 81C on an Air Force base. We are a small 1000 number PBX working off of the bigger SL 100 on the Air Force base. We are sending good digits to them for caller ID purposes, but when the phone number leaves the base it comes up with a generic billing telephone number. Does anyone know where that wouyld be programmed in the 81C? Thank you for any help you can provide.