Now that voice is working, I set out this morning to button up the VoIP firewall nice and tight. It was already set up to block all WAN to LAN traffic except SIP and RTP to the PBX. I set up rules to allow traffic from the PBX’s two IP addresses to the WAN, and block all other traffic. The minute I clicked “save”, I lost all ability to communicate with the firewall. .
Doh! I shut down the PBX, configured a laptop with the one of the PBX’s IP address, logged into the management interface of the firewall, and added provision for local workstations to access the firewall’s management screens. Then I put the laptop back in to DHCP mode, rebooted the PBX, and everything was fine.
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