Iwatsu ICON Series IX-5910 Owner's Manual page 262

Quick Dial (the system selects the outside line):
Lift the receiver
Press the Speed key SPEED
Dial Speed Dial Code
The system will automatically dial the registered number.
This operation will not work unless you register the outside line
group number.
Speed Dial Display Scrolling:
If your phone is equipped with a display you may display the Speed
Dial Numbers that are registered in both Personal and System
Speed Dial. If a name is associated with this number it will also
appear.
To display a number:
Press the Speed Dial key SPEED
Dial
Dial a Speed Dial code
To scroll up:
Dial
To scroll down:
Dial
To dial displayed number:
Press the Speed Dial key SPEED
DIGITAL TELEPHONE USER GUIDE - 242