AT&T MERLIN LEGEND Release 4.0 Feature Reference page 539

Feature Reference
In Key and Behind Switch modes, each multiline telephone (including DLCs)
and MFM device is automatically assigned one ICOM Ring and one ICOM
Voice button.
Single-Line Telephones
In Hybrid/PBX mode, each single-line telephone (or other device connected to
an 016, 012, or 008 OPT module) is automatically assigned two SA Ring
buttons and one SA Originate Only button.
In Key and Behind Switch modes, each single-line telephone (or other device
connected to an 016, 012, or 008 OPT module) is automatically assigned two
ICOM Ring buttons.
Prior to Release 4.0, the default assignment of SA or ICOM buttons to single-line
telephones is fixed and cannot be changed—no SA or ICOM buttons can be
removed or added. In Release 4.0 and later releases, the default assignment of
SA or ICOM buttons can be changed through Centralized Telephone
Programming.
A single-line telephone cannot be the principal extension for a Shared SA
button, nor can it have SSA buttons, unless the telephone is connected to a
Multi-Function Module (MFM).
Data/Video Stations
Shared SA buttons should not be assigned to video stations. Some desktop
video stations cannot have calls delivered to a Shared SA button. An incoming
call to a Shared SA button is not successfully answered and is left alerting and
unable to be used for incoming or outgoing calls.
Feature Interactions
Auto Answer All When Auto Answer All is activated, all calls received at an SA Ring,
ICOM Ring, SA Voice, or ICOM Voice button can be answered
automatically by the device connected to a General Purpose Adapter
(GPA).
If Shared SA buttons are assigned, they should be programmed for
either Delay Ring or No Ring and the corresponding SA button at the
principal extension should be programmed for Immediate Ring. This
prevents calls to the principal extension from being answered
simultaneously at the principal extension and at another device with a
corresponding Shared SA button.
Voice-announced calls received at an analog multiline telephone are
not answered by a device connected through a GPA because ringing
current is not sent to the device.
System Access/Intercom Buttons
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