NEC DS2000 Feature Handbook page 174

Speed Dial
10. Repeat from step 2 to program another bin number.
Press
To dial a System Speed Dial number:
1. Press
2. Dial the system bin number (normally 200-299).
Press a Programmable Function Key for System Speed
Dial bin.
166
OR
to exit.
and dial
OR
The stored number dials out.
.