TRANSMISSION INDENTIFICATION SYSTEM OF SPECIAL SERVICE SUBSCRIBER

摘要

PURPOSE:To attain a special service subscriber transmission identification system with sure and excellent expanding performance by communication a special service outgoing trunk and a special service subscriber circuit so as to identify a special service subscriber. CONSTITUTION:When the special service subscriber dials a special service number, the number is connected top a special service outgoing trunk 4 via a main link 5. When the trunk 4 is acquired, an OFF rela 9 is started to transmit an OFF signal to a special service subscriber circuit 6. The circuit 6 receives it to activate a CHK relay and a CHK signal is transmitted to the outgoing trunk 4 via a special service confirming signal line 7. The special service is started only after the outgoing trunk 4 receives the CHK signal, and when no CHK signal is received even after a prescribed time is elapsed after the OFF signal is transmitted, a regulation circuit 8 regulates the special service.