AT&T Merlin Legend MLX-10D User Manual page 161

Features
— No Ring keeps your phone from ringing at all.
NOTE:
Ring Timing options do not apply to
SA Originate Only or ICOM Originate Only
buttons because they do not receive calls.
Abbreviated Ringing options specify how your phone
rings when you are already on a call and another call
comes in. You program your phone to ring in one of
the following ways:
Personalized Ring options allow you to select one of
eight different ringing patterns for your phone, making
it easier to distinguish your phone's ring from someone
else's. (You hear the Personalized Ring as the long
part of the distinctive ring for an inside, outside,
returning transfer, or Callback call.)
Ringing Options
5-88
(However, the distinctive returning transfer and
Callback rings do ring at your phone.)
Abbreviated Ring is the standard (default)
setting. When you are already on a call,
another incoming call rings only once.
Repeated Ring makes your phone ring
normally. When you are already on a call,
another incoming call continues to ring until it
is answered.