Motorola A780 - Manual (Page 49)

49 External Display Features
Setting a Ring Alert Style
You can set 5 different ring alert styles on your phone, or
select Silent to turn off the incoming call alert.
From the external display home screen, rotate the rocker
switch to open the ring alert screen and highlight a ring alert
style. Press in the rocker switch to select the highlighted alert
style.
For more information about setting and using ring alert styles,
see page 146.