Panasonic KX-TD816NZ - Manual (Page 48)

2.3 Receiving Calls
48
Operation
2.3.2 Answering Hands-free (Hands-free Answerback)
To set / cancel
You can answer an intercom call without going off-hook as soon as the line is
connected. You will hear the caller talking without the phone ringing.
• The AUTO ANSWER button light shows the current status as follows:
On: Set.
Off: Not set.
Press AUTO
ANSWER.
While on-hook
PT
AUTO ANSWER
MUTE