Comdial 7OlOS System User's Manual page 32

Using Your Telephone For Conference Calls
NOTE: If all the corrference circuits are busy, you will not be able
to
add a party
to
the
conjhnce.
The message "Conference Full"
will appear in your display.
To drop out of a conference call between you and two outside
lines (creating an unsupervised conference),
l
dial # and hang up (lines remain lighted/in use until one
or both outside parties disconnect).
To rejoin an unsupervised conference between two outside lines,
l
press one of the lighted buttons where conference is
taking place.
NOTE: Conference volume levels are dependent upon the
quality of the external lines.
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