A method of restricting the call of a moving subscriber in a switched radio telephone system employing the moving subscriber profile of international standard protocol IS-41C, which consists of 8 bits with the upper 4 bits representing the values to respectively restrict a service provider, system, area...http://www.google.com/patents/US6356772?utm_source=gb-gplus-sharePatent US6356772 - Method of restricting the call of a moving subscriber in a switched radio telephone system according to international standard protocol IS-41C
