Panasonic VA-12020 Operating Instructions Manual page 38

On the DSS there is a key for each extension to enable direct contact.
In addition, the status of each extension is shown with a lamp indicator.
To transfer an outside call to an extension -
C O N F
To call an extension while talking with another extension
A station indicator will light up when
A station indicator will flash when
Z O N E
Answer the call
2 . Press the station key for the transferee
* The outside call is automatically put on hold.
3 . Press CONF key when answered
4 . Hang up
Press the desired station key while talking with another
extension or while calling
* The call will be automatically ended and the desired
extension will be called.
An extension is busy
An extension is called
Do-not-disturb is set
An extension is called with an intercom telephone
1. Lift handset
2. Press ZONE key for zone number to be paged
3. Speak into the mouthpiece of handset to make announcement
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(VA-1232:Maximum of 4 units.)