Suppression of the display of names and numbers on the called party's station is controlled by the selection of access codes (in the case of an Optiset with a display this can also be controlled using the menu item "Display Suppression" in the service menu "Additional Functions"). The access codes function differently depending on whether the line is normal or confidential.

Display suppression for a "normal line":

In the case of a "normal line", the code for display suppression on (DISUON) causes the display to be suppressed at the called party's station for the next call only.

Station Number display in the case of a "confidential line":

In the case of a "confidential line" the code for display suppression off (DISUOFF) causes the station number to be passed on for display at the called party's station for the next call.