PLANET ICF-1601 - Manual (Page 39)

Q7: How to make 3-way conference call?
A:
Please refer to the following descriptions and insert proper parameters
configurations into the device for establish the voice communications.
Example1:
(1) A and B are in the process of conversation.
(2) A want to invite C to join their conversation.
(3) A press “HOLD” button to hold the conversation with B at first then input
the number of C (plus the “OK” key).
(4) C will ring up and pick up the handset to conversation with A.
(5)A press “CONF” button again, and they will entry the 3-Way conference
mode.
Example2:
(1) A and B are in the process of conversation.
(2) B wants to invite C to join their conversation.
(3)B press “HOLD” button to hold the conversation with B at first, and then
input the number of C (plus the “OK” key).
(4) C will ring up and pick up the handset to conversation with A.
(5)B press “CONF” button again, and they will entry the 3-Way conference
mode.
" Note
The 3-Way conference mode is only support audio mode, if you
need to use the video conference, it is necessary to connect to
Multipoint Control Unit such as PLANET MCU-1400/MCU-1900.
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