Answering System Settings - Panasonic KX-TGM420 Operating Instructions Manual

Answering system settings

Call screening
While a caller is leaving a message, you can listen to
the call through the unit's speaker.
To adjust the speaker volume, press [+] or [–]
repeatedly.
You can answer the call by pressing [TALK] on the
handset or [
Call screening can be set for each unit. The default
setting is "On".
1 For handset: [MENU] [#] [3] [1] [0]
For base unit (using a handset): [MENU]
[#] [*] [3] [1] [0]
2 [ ]: Select the desired setting.  [SAVE] 
[OFF]
Number of rings before the unit answers a call
You can change the number of times the phone rings
"Ring count" before the unit answers calls. You can
select 2 to 7 rings, or "Toll saver".
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] on the base unit.