Electronic switching system having call-forwarding function
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United States of America Patent
Stats
-
May 21, 1991
Grant Date -
N/A
app pub date -
Jul 13, 1989
filing date -
Jul 13, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electronic switching system having a call-forwarding function for effecting call forwarding between subscribers. Discrimination information is added to call forwarding data for respective subscriber terminals. The discrimination information indicates whether or not each of the subscriber terminals is already registered as an elternative destination from the other subscriber terminals. When a call forward to one of the subscriber terminals is to be registered, the corresponding discrimination information is read. When the read discrimination information indicates that the subscriber terminal is not yet registered as an alternative destination, the subscriber terminal is allowed to be registered as an alternative destination. When the read discrimination information indicates that the subscriber terminal is already registered as an alternative destination, the subscriber terminal is inhibited from being registered as an alternative destination. An endless loop can be avoided at the stage of the call forward registration before execution of the call forward.
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