A common adjunct switch integrated with a telecommunications network and associated with a plurality of predetermined telephone numbers prefixed by a common code is provided with a facility which allows telephone subscribers that are assigned respective ones of the telephone numbers to personalize the...http://www.google.es/patents/US5222125?utm_source=gb-gplus-sharePatente US5222125 - System for providing personalized telephone calling features
System for providing personalized telephone calling features
