Question about Panasonic KX-T7633 Corded Phone
Since a 7640 has no *handset* (it's a DSS console) that's going to be tough to do. However, since it attaches to a 763x phone, the answer is, use the Navigator volume up arrow with the handset held to your ear.
Posted on Sep 28, 2010
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Posted on Jan 02, 2017
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The handset navigator key can be used
to navigate through menus and to select
items shown on the display by pressing (UP) (DOWN) (REVERSE) (FORWARD) buttons on the handset.
Adjusting audio volume
Press UP or DOWN button repeatedly while
The last settings of volume level will be memorized when you switch OFF the habdset. OK.
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