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5.4. PSTN-to-SIP Calling
Applications:
The applications can be for ADSL connections as in both
Diagrams A and B. Both parties are registered to SIP server
with either fixed real IP or private IP under NAT router.
Configurations:
1. Same as in Example 2.
2. Select ¡ON¡ in the ¡SIP settings / STUN setting¡ page, if
Outbound Proxy is NOT available.
3. Select ¡ON¡ for the ¡Auto Answer¡ and ¡PIN Code¡ in Call
settings. Set the Auto Answer Ring Counter, e.g. 3, and
the PIN code, e.g. 1234.
4. Make sure the REG LED is ON for a successful SIP
registration.
Callings:
5. Call from PSTN line to the IP PHONE FXO number, e.g.
7654321. In a moment, you should hear a ring back
tone, and wait for the IP PHONE to answer. After 3 rings,
the VoIP mode will auto answer with a ¡dodo¡ tone (not
dial tone). Press 1234# for PIN code and then you will
hear a dial tone for VoIP mode. Incorrect PIN Code will
result in call disconnect. If PIN code is OFF, there will be