Siemens 500 advance User Manual

If this feature is configured (contact your service per-
sonnel), you can reserve a busy trunk for your own use.
When the trunk is free, you receive a call and a message 
appears on the display.

Precondition: The message "US:Currently busy 
UK:busy at the moment" appears on your screen.

Confirm.

Your telephone rings. The display shows " Trunk is free".

C

Lift the handset. You hear the CO dial tone.

D

Enter the number of the external station.

If this function has been configured (contact your ser-
vice personnel), you can selectively assign a specific 
number (DID number) to your telephone before making 
an external call. The assigned number then appears on 
the called party’s display.

Press the key. The LED lights up.

Select and confirm.

F=:

Enter the code.

D

Enter the DID number you wish to use.

D

Dial the external number.

Program/Service

*