Panasonic KX-TGM420 Operating Instructions Manual page 159

Example:
1-222-333-4444
PPPP
8888
To erase the voicemail access number
1 [MENU] [#] [3] [3] [1]
2 Press and hold [CLEAR] until all digits are erased.
 [SAVE] [OFF]
Voicemail (VM) tone detection
Your phone service provider sends special signals
(sometimes called "voicemail tones" or "stutter tones")
to the unit to let you know you have new voicemail
messages. If you hear a series of dial tones followed
by a continuous dial tone after you press [TALK] on
the handset or press [
new voicemail messages. Soon after you hang up a call
or after the phone stops ringing, your unit checks the
phone line to see if new voicemail messages have been
recorded.
VM access number
Pauses
Password
] on the base unit, you have
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