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...an IP phone working through a linux based iptables firewall. I have an asterisk server with a public IP address. I ran netcheck from FWD. It says that it is a Port Restricted Nat. I tried the recommended FWD approach, changing the FWD-specific settings to the * server's. I have tried every conveivable config on the phone (Yes to NAT traversal with STUN field blank, No to the same, outbound proxy as the same IP address as the * server, sending DTMF over the different choices...). I have control over the iptables firewall, the phone and the * server. I imagine this is a common setup. Does an...