AT&T MERLIN LEGEND Release 4.0 Feature Reference page 504

Feature Reference
On Cover buttons programmed for Delay Ring, the delay ring interval,
set through system programming, provides a delay of 1 to 6 rings (the
factory setting is 2).
When a sender has both Individual and Group Coverage and an
Individual Coverage receiver is available, the programmed delay ring
interval of 1 to 6 rings provides a delay (in addition to the coverage
delay interval) before calls go to Group Coverage.
No Ring. Prevents the telephone from ringing at all. (However, the
distinctive returning transfer and callback rings, described later in this
section under "Distinctive Ringing," do sound.)
Send Ring. An additional Ring Timing option, used at the principal
extension to override Delay Ring programming for any Shared SA
buttons. With Send Ring on (the factory setting), a call arrives at a busy
SA button at the principal extension and rings immediately at the Shared
SA buttons programmed for Delay Ring.
Ring Timing options can be programmed individually for each personal line,
prime line, Pool, SA (including Shared SA) or ICOM, and Cover button on an
extension. The extension can also be programmed so that all outside calls on
personal line, prime line, and Pool buttons ring uniformly with one of these
options. (SA, ICOM, and Cover buttons must always be programmed
individually.)
Regardless of the Ring Timing option selected, the green LED next to the line
button with a call flashes immediately when the call arrives.
NOTE:
Ring Timing options cannot be programmed for SA Originate Only or ICOM
Originate Only buttons, since they do not ordinarily receive calls.
Abbreviated Ring Options
Abbreviated Ring specifies how a telephone rings if a call arrives when the user
is already on another call. Each extension can be programmed to ring in one of
the following ways:
Abbreviated Ring (factory setting). When the user is already on a call, a
new call arriving on a line button programmed for Immediate Ring or
Delay Ring rings only once. The ring is at a lower volume (called
attenuated ring ) than the normal ring.
Repeated Ring. The telephone rings normally. When the user is already
on a call, an incoming call continues to ring until it is answered.
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Ringing Options