l
Press line key for first call.
l
Release both line keys. (Conference
is established.)
Add-on conference
external, 2 internal parties)
l
Establish outside call.
l
Press
(outside call placed on
hold).
l
Press a memory key (or dial
extension number).
l
Ask intercom party to lift his handset,
and to press and hold down the held
line key.
l
Press and hold down the line key of
held outside call.
l
Release line key when conference is
established.