Panasonic KX-TD500 System Reference Manual page 670

Canceling all Message Waiting Indications on
your extension
1. Lift the handset.
2. Dial the feature number for
"Message Cancel" (Default : #9)
and your own extension number
in succession.
• You hear confirmation tone 2
and then dial tone 1, 3, or 4.
• The MESSAGE lamp on your
extension goes out.
3. Replace the handset.
<Supplement>
Light pattern of the MESSAGE lamp for an SLT with MESSAGE lamp.
LAMP ON
LAMP OFF
1.28sec 3.72sec
5-G-14