AT&T MERLIN LEGEND Release 4.0 Feature Reference page 164

Feature Reference
System
Access/Intercom
Buttons
Transfer
Voice Announce to
Busy
164
Coverage
A covered call remains on the sender's SA or ICOM button until it is
answered at the receiver's telephone.
A call received on a Shared SA button is not eligible for Individual or
Group Coverage.
If a receiver programs a Primary Cover, Secondary Cover, or Group
Cover button for a sender and also has a Shared SA button associated
with the sender, the green LEDs next to both the Cover button and the
Shared SA button flash. The red LED stays on at the Shared SA button,
but does not go on at the Cover button.
A call answered on a Primary Cover, Secondary Cover, or Group Cover
button can be transferred.
Calls transferred to a sender are eligible for Individual and/or Group
Coverage. However, the sender hears a call-waiting tone if he or she is
using Coverage Off to prevent calls from going to coverage and does
not have an available SA or ICOM button to receive a transferred call.
When One-Touch Transfer is programmed, a call answered on a Cover
button can be transferred by using a DSS button but not by using an
Auto Dial button.
Transfer returns are not eligible for coverage.
An inside voice-announced call is not sent to coverage, because if the
sender's speakerphone is available, the call is answered as soon as it is
made. If the sender's speakerphone is in use, the call is converted to a
ringing call and sent to coverage.