Telephonic communications – Special services
Reexamination Certificate
1998-05-18
2001-11-20
Hong, Harry S. (Department: 2642)
Telephonic communications
Special services
C379S279000, C700S002000, C700S004000
Reexamination Certificate
active
06320949
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a call processing method of a switching system, and more particularly, to a method for duplicating calls of remote multiple subscribers.
2. Description of the Related Art
In general, a switching system has a module for managing subscribers therein. Since the module is situated within a subscriber card, the subscribers have been managed by requesting and storing a database related to the subscribers by use of a communication channel within the system. That is, the subscribers have been managed in the interior of the switching system. However, it is expensive to install the system for remote subscribers, especially in systems with less than 512 subscribers. The cost may be reduced by independently separating only the subscriber module and managing the subscribers. However, if calls of the remote subscribers are managed by an additional processor, the system becomes unstable.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a method for stabilizing a switching system by duplicating calls of remote subscribers.
According to one feature of the present invention, a method for duplicating a call of a remote subscriber system having an active processor and a standby processor, includes the steps of: checking whether a call is generated from a subscriber under a normal duplication state of each of the active and standby processors; if the call is generated, transmitting a subscriber number and a voice channel number of a talk state to the standby processor; storing the subscriber number and voice channel number in a working area and connecting a port corresponding to the subscriber number and voice channel number to a time switch of the standby processor; if the call is not generated, checking whether the call is completed; and if the call is completed, transmitting a subscriber number and a voice channel number of a call release state to the standby processor and disconnecting the time switch from the port corresponding to the B channel number and the subscriber number of the talk state.
In accordance with one form of the present invention, a remote subscriber system is defined which operates in one of a talk state and a release state. The remote subscriber system includes an active processor. The active processor provides a first signal when a call is generated (talk state) and provides a second signal when the call is terminated (release state). The remote subscriber system further includes a standby processor having a plurality of ports. The standby processor is responsive to the active processor and connects one of the ports in response to the first signal and disconnects the port in response to the second signal. Preferably, the first signal and second signal include a subscriber number and a voice channel number associated with the call.
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Dilworth & Barrese LLP
Hong Harry S.
Samsung Electronics Co,. Ltd.
Tieu Benny Q.
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