Cortelco 8012 - Manual (Page 41)

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Advanced Features
Menu Navigation
1. Press the Menu soft key.
2. Press or repeatedly to scroll through menu options.
3. Press the Select soft key to select a menu.
4. Repeat scrolling and selecting if necessary.
Press the Back soft key from any menu to return to the previous screen.
Standby Mode
Press to return to standby mode. The 8012 will also return to standby mode
if no key is pressed for 40 seconds.