AT&T Merlin Legend 10BS User Manual page 101

Features
CAUTION:
If the system selects an SA Voice button
when adding a conference participant, you
hear a beep instead of ringing after you dial
the extension to be included in the
conference. If the call is not answered, and
you press Conference to complete the call,
your conversation with other parties on the
conference is broadcast on that extension's
speakerphone. Be sure to Drop an
unanswered extension on an SA Voice button
to prevent an unintentional broadcast from
happening.
Press Conference again to add another person.
6.
You are separated from the conference whale you add the next
person, but the particlpants who are already on can still talk.
7. Repeat Steps 3 through 5 to add more participants.
While on a conference:
8.
9. To end the conference, hang up.
5-24
Conference
Disconnect yourself without ending the call by
pressing Hold.
Rejoin the conference by pressing the line
button for any participant.
Disconnect a participant by pressing Drop and
then pressing participant's line button. (Do not
use Drop when the conference is on hold, or to
disconnect yourself from a conference you
initiated.)