Teo 8810 ISDN Phone - Manual (Page 15)

Tone Commander 8810 User Guide 11
After the added party answers, press the CONF key to
conference all parties together.
Repeat the above steps to add another party.
Conferencing a Held Call
Press the CONF key while you are on an active call with
another call on hold.
The current call is placed on hold and an idle call appearance
is automatically selected. The
CONF indicator lights.
Press the Call Appearance key for the held call you wish to
add to the conference.
Press the CONF key to conference all parties together.
Repeat the above steps to add another party.
Dropping the Last Party
Press the DROP key to remove the last party added to a
conference.
Terminating a Conference
Replace the handset, press the SPKR key, or press the
HEADSET key to terminate a conference, removing you and
all other parties.
Depending on your network configuration, other parties in the
conference may remain connected or be disconnected.