Panasonic KX-F280C - Manual (Page 106)

Re-recording a greeting message
You can change the content of your greeting message from a remote telephone.
Call your unit, then dial your REMOTE ANS ID while
the greeting message is playing.
Press 7 to start re-recording after hearing the beeps
that indicate the number of recorded messages.
After hearing a long beep, speak clearly and loudly for
up to 16 seconds.
When finished, press 9.
The new greeting message is played to confirm the
change.
NOTE:
If you pause for over 2 seconds while recording, the unit beeps and stops the greeting message
recording. In this case, repeat from step 2 within 10 seconds.
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