The main number for the NSAC is 800-628-2888. Paging systems integrated with large switches such as the DEFINITY G3 are supported by the Technical Service Center (TSC). The main number for the TSC is 800-242-21 21 . Domestic and International Approvals UL and CSA Listed. Page 2 of 8 Contents Page INTRODUCTION..........................................................................................................................4 PACKAGE CONTENTS............................................