User manual

11.4. VOIP EXTENSION CALLS TO PSTN ARE NOT WORKING?

You must enable the Auto Answer function in Call Settings in order to answer automatically by

VoIP mode. The Auto Answer is disabled at default. Make sure the PSTN is connected to

LINE port. When the ring count exceeds the number set in Auto Answer Counter, the FXO

port will auto answer and allow for VoIP extension call.

Extension Calls from Internet VoIP to PSTN

If the incoming call is from VoIP, then FXO port will answer with a PSTN dial tone and allow

caller to redial to PSTN phone number.

Extension Calls from PSTN to Internet VoIP

If the incoming call is from PSTN, then VS211 FXO port will answer with a short beep tone and

allow caller to redial to VoIP Phone number.