AT&T MERLIN LEGEND Release 4.0 Feature Reference page 156

Feature Reference
Considerations and Constraints
In Release 2.0 and later, if a receiver calls a sender for whom he or she is
covering and the sender is busy or unavailable, the call proceeds to other
points of coverage. It does not come back to the receiver who originated the
call. In Release 1.0 or Release 1.1, a call from a receiver to a sender is not
covered.
A maximum of eight Primary Cover and Secondary Cover buttons can be
assigned to provide Individual Coverage for a given sender. Only one Cover
button can be programmed on a multiline telephone for a given sender.
A maximum of eight Group Cover buttons can be assigned to provide Group
Coverage for each coverage group. All eight can be programmed on one
multiline telephone, or the Group Cover buttons can be distributed on as many
as eight multiline telephones.
A receiver with a multiline telephone can have a maximum of eight Cover
buttons, which can be programmed for any combination of Group and
Individual Coverage.
If a receiver has both a Primary Cover or Secondary Cover button for a sender
and a Group Cover button for the group of which the sender is a member, a call
for the sender rings only at the receiver's Primary Cover or Secondary Cover
button. This prevents multiple deliveries of the same call to the same receiver.
Each coverage group can have any number of members, from none to all the
extensions in the system.
Each sender can be a member of only one coverage group.
If a sender is a member of a coverage group and no receivers are assigned for
the group (and the sender does not have Individual Coverage), a caller hears
ringback (not a busy tone) when the sender is unavailable.
If a calling group is assigned as a receiver for a coverage group, it is the only
receiver for that group; no other types of Group Coverage receivers can be
programmed. However, individual members of the coverage group can be
senders to Individual Coverage receivers.
A calling group can be a receiver for up to 30 coverage groups.
A receiver with a Group Cover button can also be a member of the coverage
group for which the button is programmed. Calls to that receiver are sent to all
other receivers programmed for the group.
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Coverage