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Telephone system works on the modem technology. There are different types of modems available. Any mobile available in the market is made up of a inbuilt modem and the controlling software. In market GSM and GPRS modems are also available. So keeping these things in consideration we are building a project to control the GSM modem which is connected to the system.
We are connecting the GSM modem to the system using any supportable port like serial or USB port then develop software to control the functionality of the system.