Features and MenuCards866 Charge settings: If your network operator transmits the call-charge data, you candisplay them (Charge), switch to Duration (call time indication) or switch the chargedisplay off (Off ).7 Add-on adapter: In order to configure and activate the external audio devices con-nected to your system telephone, you use 1 Add-on selection to select the type ofanalogue device connected to socket 1 (Ear cap, Second handset, Headset, Activespeaker box, Ext. microphone, DECT-Headset), or deactivate the socket with off.You use 2 Add-on volume to adjust the volume of the device. Use 3 Relay selectionto select the type of device connected via a relay to socket 2 or socket 4. You canselect either Record (recording equipment connected to socket 2) or Door display(the “Door busy” indicator connected to socket 4). Select off to deactivate the socket.You can activate or deactivate some external audio devices directly via the followingmenu items (each with the options on or off ):4 Door display5 Record6 Second handset7 Headset8 DECT-Headset8 Display: Select 1 Contrast or 2 Language. With Contrast you can adjust the displaycontrast by using the key (or one of the digits from to ). WithLanguage you can set the language used on the display by selecting one from the listprovided.If your OpenPhone 65 system telephone has been expanded by one or more add-onkeypad modules, you can set the display contrast for each keypad module separately.Select 1 Contrast, then select the desired Keypad module from the following menu.You set the display contrast in levels, using the key, or you enter a digit fromto .MenuCard “Protection”Select 5 Protection, followed by …1 Call prot. phone: This switches call signalling on your telephone for all calls or forinternal only/for external calls only On/Off (with the exception of VIP and hunt groupcalls). When there are multiple trunk keys configured on your telephone, you canswitch call protection for each of these keys on or off. To do so, select the desired keyfrom the displayed list and press . If call protection should apply to all con-figured trunk keys, select the Device menu entry and press . The most recentlyactivated call protection appears in the first line. In order to change this, you select