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 Title: |
EP0350918B1:
Electronic switching system having call-forwarding function[German][French]
[ Derwent Title ]
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Country:
Kind: |
EP European Patent Office (EPO)
B1 PATENT SPECIFICATION i
(See also:
EP0350918A2,
EP0350918A3 )
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| Inventor: |
Suzuki, Takashi;
Nakagiri, Etsuji;
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| Assignee: |
FUJITSU LIMITED
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| Published / Filed: |
1994-10-12
/ 1989-07-13
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| Application Number: |
EP1989000112847
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| IPC Code: |
Advanced:
H04M 3/54;
H04Q 3/545;
Core:
more...
IPC-7:
H04M 3/54;
H04Q 3/545;
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| ECLA Code: |
H04M3/54; H04Q3/545;
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| Priority Number: |
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| Abstract: |
[From equivalent
EP0350918A2]
Disclosed is an electronic switching system having a call-forwarding function for effecting call forwarding between subscribers, wherein discrimination information is added to call forwarding data for respective subscriber terminals (A,B,C,D), the discrimination information indicating whether or not each of the subscriber terminals is already registered as an alternative destination from 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, and when the read discriminating 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. Whereby, an endless loop can be avoided at the stage of the call forward registration before execution of the call forward.
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| Attorney, Agent or Firm: |
Lehn, Werner, Dipl.-Ing. et al ;
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| INPADOC Legal Status: |
Show legal status actions
Family Legal Status Report
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| Designated Country: |
DE FR GB
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| Family: |
Show 9 known family members
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First Claim:
Show all claims |
1. An electronic switching system having a call-forwarding function for effecting a call forward between subscribers, characterized by:
a plurality of subscriber terminals (A,B,C,D);
a switching network (1) accommodating said subscriber terminals;
a storage unit (3), connected to said switching network, for storing data used to forward calls for said subscriber terminals;
a discrimination information adding means (2), connected to said storage, for adding discrimination information to said data for respective subscriber terminals, said discrimination information indicating whether or not each of said subscriber terminals is already registered as an alternative destination from another subscriber terminal accommodated by said switching network;
a discrimination information reading means (2), connected to said discrimination information adding means, for reading, when a call forward from one of said subscriber terminals to another of said subscriber terminals is to be registered into said storage, said discrimination information of said another of said subscriber terminals;
whereby, when the read discrimination information indicates that said another of said subscriber terminals is not registered as an alternative destination, said another of said subscriber terminals is allowed to be registered as an alternative destination, and when the read discrimination information indicates that said another of said subscriber terminals is already registered as an alternative destination, said another of said subscriber terminals is inhibited from being registered as an alternative destination.
[German]
[French]
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Description
Expand description |
+ BACKGROUND OF THE INVENTION
+ 1. Field of the Invention
The present invention relates to an electronic switching system having a call-forwarding function for effecting call forwarding between subscriber terminals, based on data used for call forwarding stored in a storage unit in the electronic switching system which accommodates a plurality of subscriber terminals, and more particularly, it relates to a system for preventing an endless loop in the call forwarding process.
+ 2. Description of the Related Arts
+ SUMMARY OF THE INVENTION
+ Brief Description of the Drawings
+ DESCRIPTION OF THE PREFERRED EMBODIMENTS
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