Panasonic 2001 - Manual (Page 56)

Additional calling features
56
Overriding a busy signal
Use the Override feature to override a busy signal and interrupt another
call.
To override a busy/engaged signal:
To end the connection:
Using Privacy Release
Use the
Privacy Release feature to enable one or more people who share
your DN to join a call.
To use Privacy Release on an established call:
You dial a telephone number and receive a
busy signal.
Enter the
Override
FFC.
The people in the targeted call receive a tone
for approximately one second. After the
Override feature joins you to their call, a
short tone repeats every 16 seconds.
(Goodbye)
Press the
Goodbye key.
Press the
Privacy Release
soft key during a
call.
A person joins the call by pressing the
shared number (DN) key on their telephone
(Multiple Appearance DN
feature).