Panasonic KX-TG633SK Operating Instructions Manual page 27

Caller's recording time
You can change the maximum message
recording time allowed for each caller.
1
MMENUN#305
2
MbN: Select the desired setting. a
MSAVEN a MOFFN
Selecting "Greeting only"
You can select "Greeting only" which sets
the unit to announce a greeting message to
callers but not record messages.
Select "Greeting only" in step 2 on
"Caller's recording time", page 27.
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Answering System
27