A method is disclosed of processing telephone calls with customized services in a telephone system with CCIS (Common Channel Interoffice Signaling) in which all offices are not required to have CCIS capability. The entitlement of a call to customized service is verified by transmitting from an action...http://www.google.ca/patents/US4310727?utm_source=gb-gplus-sharePatent US4310727 - Method of processing special service telephone calls
