AT&T 993 2-Line - Manual (Page 74)

7
Appendix
Default settings
FEATURE
Speakerphone volume
Handset volume
Headset volume
Ringer volume
Auto speaker
Primary line
Automatic line selection
Preferred mode
Time and date
Screen backlight
Scroll rate
COVM indicators
Call history
Repeat calls
Caller ID/call waiting
Language
DEFAULT
5
minimum
minimum
5
Off
Line 
On
Speakerphone
2:00 AM, /0
On
Medium
Off
All calls
Combined
On
English