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Old 11-18-2014, 05:32 AM
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Hopefully there's a Session Border Controller in front of the IPO. The private side of the SBC should be on the customer network together with the LAN1 port. Telco should be talking to the public side of the SBC. It's the SBC that should be delineating between trusted and untrusted, not the IPO using the two network ports.

If there's no SBC and only a Sonicwall, make sure any SIP ALG is disabled and the SIP signaling and media is port forwarded to the IPO. Look in the IPO SIP line config to find these ports. Signaling is typically UDP 5060.
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