Special service call processing, such as 800 processing, is improved in accordance with the present invention. A data base includes a customer subscription record segment which stores call processing data keyed at least in part on a dialed 800 number. The subscription record for a customer is hierarchical...http://www.google.com/patents/US5095505?utm_source=gb-gplus-sharePatent US5095505 - Efficient flexible special service call processing
