AASTRA 4220 Lite for BusinessPhone User Guide EN - Manual (Page 72)

Other Useful Features
BusinessPhone – Dialog 4220 Lite / Dialog 3210 72
To deactivate the Tandem configuration
Secondary on/off
Х Ф
Press (pre-programmed).
Or: #28#
Dial to log off the secondary telephone.
For incoming calls:
•
The secondary telephone cannot be called and the primary
telephone works as a normal stand-alone telephone.
For outgoing calls:
•
Both telephones are treated as 2 separate extensions.
Transferring a call between members of a Tandem unit
Inquiry
Ô z
Press and dial own directory number.
Transfer
Ô
Press (pre-programmed).
Or: d
Go on-hook.