AT&T Merlin Legend MLX-10 User Manual page 75

Features
NOTE:
When the light at this button is off, all calls to you are sent
to Coverage, unless you have also activated Coverage
Inside Off or Coverage VMS, as described in the
preceding sections.
Receiving Calls Sent to Coverage
If you provide Individual Coverage, you must program an
Individual Coverage button (either primary or secondary) for
each person whose calls you cover. If you provide Group
Coverage, you must program at least one Group Coverage
button for each group whose calls you cover. To handle more
than one call at a time for a particular group, you can program
more than one Group Coverage button for that group.
You can program a total of eight Coverage buttons on your
phone, and they can be any combination of Individual and
Group Coverage.
5-24 Coverage