AT&T MERLIN LEGEND Release 4.0 Feature Reference page 145

Feature Reference
receivers are unavailable or not programmed will the call go to another, more
impersonal type of Group Coverage—either the QCC queue or a calling group.
A call to a sender that is also ringing on Primary Cover, Secondary Cover,
and/or Group Cover buttons rings until answered (or the caller hangs up). When
the call is answered, the ringing and flashing green LED are removed from all
other telephones providing coverage for the sender. However, when a calling
group is programmed as the receiver for a coverage group, the ringing and
flashing green LED are removed from the sender's telephone as the call leaves
the calling group queue and is sent to an available calling group member. (A
call on a personal line button on the sender's telephone is an exception. The
ringing and flashing green LED remain on that button until answered, either by
the sender or by a receiver.)
NOTE:
The duration of the ringback heard by an outside caller is shorter than the actual
ring heard at an MLX or analog multiline telephone. Therefore, an outside caller
hears one or two rings, and may also hear the number of rings programmed for
the coverage delay interval, plus the number of rings programmed for the Delay
Ring interval. For example, if the coverage delay interval is programmed for one
ring and the Delay Ring interval is programmed for two rings, an outside caller
hears four rings before the call begins ringing at receivers' telephones. If both
intervals are set to their maximum values, the caller can hear up to two
additional rings.
A call goes to Group Coverage depending on the following conditions:
Whether the sender is available or unavailable
Whether the sender has Individual Coverage (Primary Cover or
Secondary Cover buttons programmed on other extensions), and if so,
whether an Individual Coverage receiver is available
The type of Group Coverage receivers programmed:
Only Group Cover buttons on multiline telephones
Only the QCC queue
Only a calling group
The value set for the coverage delay interval through system
programming (1–9 rings). When used in combination with Delay Ring,
make sure that this value is higher than the Delay Ring interval.
The value set for the Delay Ring interval (1–6 rings) through system
programming (affects Individual Coverage only).
A sender is considered unavailable (his or her telephone does not ring) under
the following conditions:
The sender has turned on Do Not Disturb.
All SA or ICOM buttons are in use on the sender's telephone.
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Coverage