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5.3. SIP-to-PSTN Calling
Applications:
The SIP-to-PSTN calling works when both calling and
answering parties are registered to SIP server with given
registered phone numbers. The ADSL can be 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. Upon successful SIP registration, the REG LED indicator
will be ON.
Callings:
5. Pick up the phone for VoIP mode, and press 1688# or
1688 to call another IP Phone with registered SIP phone
number 1688.
6. After 3 rings for Auto Answer, the FXO port will auto
answer with a ¡dodo¡ tone (not dial tone). Press 1234# for
PIN code and then you will hear a PSTN dial tone. Note