LevelOne VOI-7100 - Manual (Page 67)

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5.1. PSTN Calling
Applications:
VOI-7100 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.