AT&T MERLIN LEGEND System Reference Manual page 134

Features
Delayed Ring. The green LED next to the Secondary Cover button flashes
immediately, and the receiver's telephone rings after the sender's
telephone rings two times (the Secondary Delay Interval) plus the
programmed Delayed Ring Interval (1-6 rings). For example, if the
Delayed Ring Interval is set to two rings, the receiver's telephone rings
after the sender's telephone rings four times.
No Ring. The green LED next to the Secondary Cover button flashes
immediately, but the receiver's telephone does not ring.
Secondary lndividual Coverage is useful for executives who want calls
covered only when they are unable to answer or for DLC system operators
who want a co-worker to provide backup during peak calling periods.
Both Primary Cover and Secondary Cover buttons can be programmed for each
individual sender (a maximum of eight).
Calls ringing on Primary Cover and/or Secondary Cover buttons ring until
answered. When the call is answered, the call appearance is removed from all
telephones involved in the coverage arrangement.
The factory setting covers both inside and outside calls. The sender can
program the telephone to have only outside calls covered. A sender can also
program a Coverage On/Off button to allow or prevent calls from going to
receivers.
Figure 2-2 shows examples of the LED and ringing patterns when both Primary
Cover and Secondary Cover buttons are programmed for an individual sender.
Coverage 2-85