METHOD FOR PROCESSING CALL INCOMING FROM OFFICE LINE IN KEY TELEPHONE SYSTEM

摘要

PURPOSE: A method for processing an incoming call signal received through a central office line in a keyphone system is to connect an incoming call signal to an extension line directly by performing an automatic relay service. CONSTITUTION: Ordinary called extension numbers and automatic-relay called extension numbers are registered according to respective central office lines. In case where a ring incoming call signal is received from the central office line(201), a corresponding automatic-relay called extension number is called(202). After the automatic-relay called extension line is responded, a corresponding ordinary called extension number is called and a timing is counted(204). If there is a request for switching to the automatic-relay extension line(211), a call of the ordinarily called extension line is stopped(212) and a call of the automatic-relay called extension is processed(213).