In night service mode, for example  during lunch breaks or after office hours, all external calls are forwarded to a particular internal telephone (night station) The night station can be defined by the service engineer (= standard night service) or by you (= temporary night service). When night service is active, the night station assumes the function of the intercept station. 

Activating night service

Press the Talk key. 

Call the system menu. 

Select and confirm the menu item. 

Select and confirm the menu item.
"Standard night service" is configured. 

Enter an internal phone number. 

Save the settings.
"Temporary night service" is configured. 

Press the On-hook key to end the process. 

Deactivating night service

Press the Talk key. 

Call the system menu. 

Select and confirm the menu item.  

Press the On-hook key to end the process.