AT&T MERLIN LEGEND Release 2.0 Analog Direct-Line Console Operator's Manual page 44

Quick Start
5. Confirm participation:
If the person is available, announce the
If the person is unavailable, hang up.
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.
6. Press Conference again to add another person.
You are separated from the conference while you add the next
person, but the participants who are already on can still talk.
7. Repeat Steps 3 through 5 to add more participants.
Setting Up a Conference
2-12
conference and press Conference.
All participants, including you, are connected.
If this is the case, select a new line and make
another call or return to the original call.