Assignment - Software Design for Telephone System

Assignment - Software Design for Telephone System

Assumptions :-
· The software is designed for local calls only, it will serve the people living in that geographic area.
· This system does not support conference.
· The subscriber will not be allowed to make any calls if his account accumulates an outstanding bill of £500 or more.
· The system will start charging once the connection is successful, and not during connecting or unsuccessful call.
· The system will disconnect from the caller if the connecting sequence has reached a timeout period of 1min.
· There are voice recorded messages that can be played to the caller when there are certain errors encountered.


This software will be running at the local exchange to manage the connections and charge the subscribers for the service. This telephone switching system consists of mainly two components, the controlling software and the electronic switching circuitry. It controls and allows two us...