AT&T MERLIN LEGEND Release 4.0 Feature Reference page 536

Feature Reference
The telephone user at the principal extension can use Send Ring. This feature
overrides Delay Ring programmed for any telephones with Shared SA buttons
for the principal extension. When a call arrives for the principal extension while it
is busy, the telephones with the Shared SA buttons for that extension ring
immediately.
When Do Not Disturb is turned on at the principal extension, calls do not ring at
that extension or at other telephones with Shared SA buttons for that extension.
The principal extension or a Shared SA button can be used to join a
conversation in progress. A maximum of three parties can participate in one
call.
NOTES:
1. Shared SA buttons cannot be assigned to single-line telephones or other
tip/ring equipment connected to an 016, 012, or 008 OPT module. Shared
SA buttons can be assigned to a tip/ring or external alert device connected
to an MFM in an MLX telephone or a GPA connected to an analog multiline
telephone.
2. Shared SA buttons cannot be assigned when the SA button is on a single-
line telephone set. A single-line telephone cannot be the principal extension
for a Shared SA button, unless the telephone is connected to an MFM.
ICOM Buttons: Key and Behind Switch Modes
In Key mode and Behind Switch mode, telephones have ICOM buttons, which
are used as follows:
To dial the Idle Line Access code (usually
personal line assigned to the telephone (Key mode only)
To make an inside call
To activate a feature by using a feature code
To receive inside calls, including voice-announced calls, and transferred
outside calls
An ICOM button can have one of three attributes:
Ring. This button is used to make inside ringing calls, to receive inside
and transferred outside calls, and to dial the Idle Line Access code to
select a personal line.
Voice. This button is used to make inside voice-announced calls, to
receive inside ringing calls, and to dial the Idle Line Access code to
select a personal line. If the person receiving an inside call made from
this button has a speakerphone and it is not already in use or disabled by
having Voice Announce to Busy turned off, the call arrives on the
speakerphone. Both parties hear a beep and the called person hears the
536
System Access/Intercom Buttons
) to select the first idle
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