RCA Model 21011 - Manual (Page 37)

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EXTENSION ?
EXIT
LINE ON HOLD
2. Press the CONF soft key on your handset or base. LINE ON HOLD
EXTENSION? shows in the display.
3. Enter the desired handset number to select the base or the handset
number you want to conference with. The receiving party is paged.
SENDING HANDSET RECEIVING HANDSET
4. The receiving handset or base must press the page/int button to answer
the intercom, then both intercom users may speak privately. The
external caller cannot hear the intercom conversation.
SENDING HANDSET RECEIVING HANDSET
5. Either sending or receiving party may press the format/conference
button to start the 3-way conference.
NOTE: Press the EXIT soft key on either handset to cancel the intercom call
and let the sending party continue to talk to the external party. Or the calling
party may press the talk/callback button to transfer the call to the receiving
party who may speak to the external caller independently.
NOTE: A handset or the base can enter conference directly by pressing talk/
callback on the base while the other handset or the base is on an external call.
HANDSET 2
EXIT
PAGING/LINE ON HOLD
HANDSET 1
PAGING FROM
HANDSET 2
LINE ON HOLD/INTERCOM
EXIT MUTE
HANDSET 1
INTERCOM
EXIT MUTE