If your communication system is connected to an ISDN multiple device line, then you can forward all incoming calls from the public network through your multiple subscriber number (MSN) to an external destination. 

There are three types of forwarding: 

Calls are forwarded immediately (1=immediate call forwarding).

Calls are forwarded after a certain time (2=unanswered calls).

Calls are only forwarded when the line is busy (3=when busy).

Activating call forwarding to a "trunk"

Press the Talk key. 

Call the system menu. 

Select and confirm the menu item. 

Select and confirm the menu item. 

Enter and confirm your own multiple subscriber number. 

Select and confirm the menu item. 

Select and confirm the menu item. 

Select and confirm the menu item. 

Enter the phone number of the destination (without external code). 

Save the settings. 

Deactivating call forwarding to a "trunk"

Press the Talk key. 

Call the system menu. 

Select and confirm the menu item. 

Select and confirm the menu item. 

Follow the user guidance system from this point onwards (enter a multiple subscriber number or DID and forwarding type). 

Confirm your entries. 

Press the On-hook key to end the process.