Polycom Trio 8800 System User's Manual page 20

Step 3: Type the number you wish to add to
the conference call and press the "Dial"
button.
Step 5: If you do not want to add a user you
can return to the call by pressing the "Back to
Call" banner.
Step 4: Alternatively you can select a user to
add to the conference call using the contacts
or recent calls list.
Step 6: Any participants will be listed on the
active conference call screen.
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