AT&T MERLIN LEGEND System Reference Manual page 298

Features
When any of the conditions listed above exist, the user hears ringback if the
person called has an available System Access or Intercom button, or hears the
busy, call waiting, or Callback tone when the person called is busy on all System
Access, Intercom, or QCC Call (Hybrid/PBX only) buttons. If the person called is
using Do Not Disturb, the user hears a busy tone.
Speakerphone Paging to an individual telephone is considered an inside call.
The green LED next to an available System Access or Intercom flashes to
indicate an incoming call. The person called can use the HFAI (Hands Free
Answer on Intercom) feature to talk to the caller or can pick up the handset and
speak to the caller.
Group Paging
Group Paging is used to direct Speakerphone Paging to a selected group of
telephones, such as a department or work area, or to all telephones in the
system, except QCC system operator positions.
A maximum of seven speakerphone paging groups can be set up through
system programming, and up to ten telephones can be assigned to the first six
speakerphone paging groups. A telephone can being to more than one
speakerphone paging group.
The system automatically reserves extension numbers 793-798 for the first six
speakerphone paging groups. The seventh speakerphone paging group is
called the "Page All" group and is factory-set to page all extension numbers. The
system automatically reserves extension number 799 for the Page All group.
When the extension number for a speakerphone paging group is dialed by
using the System Access or intercom button, the announcement is heard over
the speakerphones on all telephones assigned to the group. If the extension
dialed is for the Page All group, the announcement is heard on speakerphones
throughout the system. A speakerphone paging group member does not hear a
group page if one of the following conditions exists:
The paging group member is using the speakerphone.
The paging group member is on an analog multiline telephone, and Voice
Announce To Busy is not assigned to the telephone.
The paging group member has an MLX telephone and has disabled voice-
announcements.
The paging group member has an MLX telephone and is in the programming
mode (extension, centralized, or system), or in the test mode.
The paging group member has an analog multiline telephone and is in the
extension programming mode (speakerphone pages are received on an
analog multiline telephone in the test mode).
The paging group member is using Do Not Disturb.
When a group member does not hear the announcement for any of the above
reasons, the caller is not notified unless all telephones in the group cannot hear
the page, in which case, the caller hears the busy signal.
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