Vertical Communications DSU and DSU II - Manual (Page 109)

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To create these feature access buttons proceed as follows:
1. Press OPTIONS.
2. Press NEXT until FEAT appears.
3. Press FEAT.
4. Press NEXT repeatedly until desired feature choice is displayed.
5. Press one of the buttons below currently displayed selections to
choose desired selection.
6. Respond to any menu prompts associated with feature (such as
all-call or zone 1 to 3 for PAGE or orbit 1 to 9 for PARK).
7. Press programmable button for storage location.
8. Press PREV or NEXT until next feature choice is displayed or
until EXIT is displayed;
9. Repeat last two steps until all feature buttons are programmed,
—OR—
press EXIT to end.
To clear a feature access button assignment, repeat the programming
procedure but press CLEAR before pressing storage location button.
GCA70–245 Programming Your Telephone
LCD Speakerphone Reference Manual 10–7