LevelOne VOI-7011 - Manual (Page 32)

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Auto Answer
You may enable the Auto Answer function to answer the
incoming call by FXO port. When the ring count exceeds the
number set in Auto Answer Counter, the FXO port will auto
answer and allow for extension calls from PSTN to VoIP and
vice versa.
For the incoming call from the Internet, the FXO port will
answer with a PSTN dial tone and allow caller to redial to
PSTN phone number. For the incoming call from PSTN, the
FXO port will answer with a short beep tone and allow caller to
redial to VoIP number. PIN Code is used to prevent from call
piracy. The caller needs to enter the right PIN code followed by
“#” to get the PSTN dial tone. Incorrect PIN Code will result in
call disconnect. The Auto Answer is disabled at default.