LevelOne VOI-7011 - Manual (Page 94)

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5.1. PSTN Calling
Applications:
VOI-7011 is default at the VoIP mode. For PSTN calls, you
may just pick up the phone, press 0* key or PSTN function key,
and dial directly to the PSTN number like a normal telephone.
Configurations:
The “Auto Answer” is OFF at default, and the function of
extension call from SIP to PSTN is disabled. The FXO port is
for PSTN only and no configuration is needed.
Calling/Answering:
1. Pick up the phone and press PSTN function key, and you
should hear a dial tone.
2. Press, e.g. 7654321 , to call the PSTN party with 7654321.
In a moment, you should hear a ring back tone, and wait
for the called PSTN party to answer.
3. For receiving PSTN incoming calls, you just pick up the
phone to answer when ringing.