AT&T MERLIN LEGEND System Reference Manual page 299

Features
Loudspeaker Paging
Telephone Differences
Queued Call Console
All Other Multiline
Telephones
2-250 Paging
A call to a speakerphone paging group is not considered an inside call. The
people being paged can only listen to the page over the speakerphone and
cannot respond to the person making the page.
Loudspeaker Paging is used when a loudspeaker paging system is connected
to the system on a line jack programmed as a loudspeaker paging port. A
maximum of three line jacks can be programmed as loudspeaker paging ports.
Pages over a loudspeaker paging system are heard everywhere in the building
or just in a particular area, depending on whether or not the loudspeaker system
is a multi-zone paging system.
A QCC cannot make and receive voice-announced inside calls (speaker-phone
calls to an individual extension). A QCC cannot be a member of a
speakerphone paging group. The QCC system operator can use the Group
Page feature by selecting a Call button and pressing the DSS button or dialing
the extension for the group.
A QCC system operator can use a loudspeaker paging system only by
selecting a Call button, selecting Loudspeaker Paging from the display, and
then dialing the loudspeaker paging port's line number (801-880).
To direct Speakerphone Paging to an individual telephone, the multiline
telephone user selects a System Access Voice or Intercom Voice button, dials
the extension number, and speaks into the handset or speakerphone. To direct
Speakerphone Paging to a group of telephones or to all telephones by using
Page All, the multiline telephone user selects any System Access or Intercom
button, presses the programmed Group Page button or dials the extension for
the speakerphone paging group or Page All group, and speaks into the
handset. (Using a speakerphone for a group page can cause feedback.)
A multiline telephone user can access the loudspeaker paging equipment and
make an announcement via Loudspeaker Paging by selecting:
A line button programmed for the line jack on which the loudspeaker paging
system is connected.
A System Access button and dialing the pool dial-out code for the
loudspeaker paging port (Hybrid/PBX only).
An Intercom or System Access button (either by pressing a Pickup button
programmed specifically for the paging port or pressing the Feature button),
and then dialing the Pickup feature code (9), and then the paging port's line
number (801-880).
Loudspeaker Page from the display (MLX display telephones only) and
dialing the line number (801-880).