AT&T 2820 - Manual (Page 32)

EN
2. Use or to select the intercom handset and touch or dial
the handset number you wish to call. If the handset selected is not
available, the line is automatically reconnected with the original call.
3. If other handset connects (by touching ) , the handset number
will appear. Touch to toggle between the internal and external
line.
4. To transfer the call, touch in handset 1, or place the handset 1
back into the base cradle.
To establish an intercom conference call with an outside line:
1. Connect to an outside line by making or answering a call.
2. Transfer the call to another handset (see above) and press
to
begin an intercom conference call.
OR
Touch on the any other handset to begin the conference call.
3. Touch on either handset to finish the intercom conference call.
The connection will remain between the other handset and the
outside line.
NOTE: ‘INTERCOM HOLD’ will appear in the other handset if you have
toggled to an external line during an intercom call.
The Room Monitor feature can be used to listen through another handset
located in a nearby room. When the Room Monitor feature is set, another
handset user can listen to the sound surrounding the room monitor unit
by using the Intercom function. The called handset will display ‘ROOM
MONITOR’ in the middle of the screen and transmit the microphone signal
to the calling handset. It will not generate the audio signal received from
the calling handset.
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ROOM MONITOR