It is a device through which calls are made independently and separately from external connecting lines, and therefore whatever the duration of the call is long it does not affect the phone bill paid by the company or the government sector, and among the functions provided by the private exchange is the transfer of external calls (coming from abroad) to an internal sub phone, As well as the internal (internal) connection to an external number, then transfer to another sub phone and make multi-lateral calls.

Central Services :

1- The main capacity of the central digital system starts from three external lines and eight expandable internal lines.

2- The central is equipped with an internal charger, and batteries can only be installed to power the central when the power is off.

3- The ability to record a directed voice message and enter directly on an internal line.

4- The possibility of installing a printer on the central to print the required phone numbers and the time of the call.

5- The possibility of ordering direct or international lines only via code to ensure that others do not use it.

 6- The possibility of not allowing multiple internal phones to request any external lines except through a secret code.

7- The ability to transfer incoming external calls to a line, either external or internal.

8- The possibility to set a meeting of 5 people.

9-Transfer incoming calls on any internal line to another line.