Panasonic KX-TGM420 Operating Instructions Manual page 140

Operating the answering system during playback
Key
[+] or [–]
[ ]

[ ]

[] (STOP)
[ERASE/ MUTE]
*1 If pressed within the first 5 seconds of a message,
the previous message is played.
Erasing all messages
Press [ERASE/MUTE] 2 times while the unit is not in
use.
Using the handset
When new messages have been recorded:
– "New message" is displayed.
– The message indicator on the handset flashes slowly
if the handset message indicator's "New message"
setting is enabled (page 61).
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Operation
Adjust the speaker volume
Repeat message*1
Skip message
Stop playback
Erase currently playing message