Answer:

Transferred calls have a distinctive ring - one short and one long ring.

How to use:
To Transfer a call:

1. Press [Transfer].
2. Dial the intercom number or press the Intercom Auto Dial button of the extension you want to transfer the call to.
3. Hang up.

To Transfer with Voice Announcement:

1. Press [Transfer].
2. Press [Intercom].
3. Dial the intercom number or press the Intercom Auto Dial button of the extension you want to transfer the call to.
4. When you hear the beep, announce the call.
5. Hang up. 
6.  
7.  
8.  
9.  
10.  
11.  
12.  
13.  
14.