Method for duplicating calls of remote multiple subscribers

A method for duplicating a call of a remote subscriber system having an active processor and a standby processor, comprising the steps of:

• checking whether a call is generated from a subscriber under a normal duplication state of each of said active and standby processors;
• if the call is generated, transmitting a subscriber number and a voice channel number of a talk state to said standby processor;
• storing said 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 said standby processor;
• 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 said standby processor and disconnecting said time switch from the port corresponding to the voice channel number and the subscriber number of the talk state.

A remote subscriber system having a talk state and a release state and duplicating a call in response to a call state, the remote subscriber system comprising:

• means for determining that a call is initiated in a first port;
• means for duplicating the call by connecting a second port when the call is initiated;
• means for determining that the call is terminated;
• and
• means for disconnecting the second port when the call is terminated.