AT&T MERLIN LEGEND Release 4.0 Feature Reference page 506

Feature Reference
Delay Ring is especially useful on a Cover button, because it gives the sender a
chance to answer before the call rings at the receiver's telephone. No Ring is
appropriate for users who do not usually answer outside calls. To answer a call
when a telephone is programmed not to ring, simply press the line button with
the flashing green LED.
While using programming codes or display selections to program Ring Timing
options for one line, press a line to which these options apply—any line button
with an outside line or any SA or ICOM button. If you press any other type of
button, an error tone sounds; the display telephone user also sees an error
message. While programming Ring Timing options for all outside lines, you can
press any line button, not necessarily an outside line button.
Telephone Differences
Queued Call Consoles
Ringing options cannot be programmed on a QCC. The Call buttons are fixed to
Immediate Ring. A QCC receives only two types of distinctive ringing—one ring
for an inside call and two rings for an outside call.
Other Multiline Telephones
Personalized Ringing can be programmed for an MLC-5 cordless telephone
only through centralized telephone programming.
Personalized Ringing is not supported on MDC 9000 telephones.
Ring Timing Options can be programmed for a Multi-Function Module (MFM)
only through centralized telephone programming.
Single-Line Telephones
Neither Abbreviated Ring nor Personalized Ringing can be programmed for
single-line telephones, and Ring Timing options can be programmed only
through centralized telephone programming.
Single-line telephones connected to an 008 OPT module do not receive
distinctive ringing for the various call types listed in Table 37.
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Ringing Options