AT&T 2320 - Manual (Page 28)

2 5
C o n f e rence Calling
1 If one handset is already on a call, you can
connect a second handset to the call by
pressing
on the second handset
— OR —
You can first intercom another handset by
pressing .,then when the desired
handset is highlighted. After the other handset
answers the intercom call, press and hold .
2 Disconnect either or both handsets by
pressing
.