The switch has a call identifier for all the telephone lines without requiring any other accessory.
Nevertheless, it is necessary to program the lines and extension lines of the switch, enable the function altering the jumper in the trunk board (J3A up to J3H and J4A up to J4H) and contract the service with the telephone company.
Configuration of jumper: J3 (A a H) position 2-3 and J4 (A to H) position 1-2 configured for call ID.
Boards: 3250461/1 and 3250461/2
New boards and board 2 junctors and 12 extension lines: as of 3250461/3.
Configuration of jumper: J3 (A to H) and J4 (A to H) configured in position 2-3 for call ID.