Vertical Communications DSU and DSU II - Manual (Page 105)

Autodial Numbers
1 13
2 14
3 15
4 16
5 17
6 18
7 19
8 20
9 21
10 22
11 23
12 24
Personal Speed Dial Numbers (Keypad
Buttons)
0 5
1 6
2 7
3 8
4 9
GCA70–245 Programming Your Telephone
LCD Speakerphone Reference Manual 10–3