AT&T 5840 - Manual (Page 28)

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Volume
Handset
You can adjust the volume of what you hear through
the handset during a conversation by pressing
+ or -
on the right side of the handset. You will hear a
special tone when you reach the highest or lowest
setting.
Base Speaker
Press VOLUME
+ or VOLUME - to adjust the base
speaker volume while on a call. You will hear a special
tone when you reach the highest or lowest setting.
TELEPHONE OPERA
TION
TELEPHONE OPERA
TION
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