AT&T MERLIN LEGEND Release 4.0 Feature Reference page 46

Feature Reference
Group Calling
Ringing Options
System
Access/Intercom
Buttons
Voice Announce
46
Auto Answer All
Members in a calling group with analog multiline telephones can use
Auto Answer All when answering machines are connected to their
extensions. When the feature is activated, all incoming calls ringing on
the calling group member's extension—both calls for the calling group
and calls to the member's own extension—are answered automatically
by the answering machine.
An analog multiline telephone user selects the lines to be answered by
programming them for Immediate or Delay Ring and selects the lines
not to be answered by programming them for No Ring. If the device is
to answer only inside calls, all personal lines (outside lines assigned to
buttons on the telephone) must be programmed for No Ring.
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 the GPA. If Shared SA
buttons are assigned, only the principal extension should be
programmed for Immediate Ring to prevent the call from being
answered at the principal extension and at extensions with the 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.