During the incoming call press INT followed by the destination handset number. (Caller is put on hold and the other handset will ring). At the other handset, the user answers by pressing Green phone symbol. Person transferring the call announces the caller and then presses green handset symbol to transfer the call. Hang up.
Job done!!!!!! Hope this helps
Geoff Mortimer (12gggeoff@tiscali.co.uk), May 2008