A telephone service available both in digital and analogue systems allows displaying a number of the calling subscriber on the display. And where it is
possible the caller’s name can be also lighted up.
The function allows the user by entering a 5-digit number to receive a call from any concrete company’s telephone. There are no definite groups for picking up the call. One can pick up the call from any telephone set; it is only necessary to enter the required code and the extension number of the phone, which has to be picked up.