After five or six months of trying, the AT&T IPFlex system is now working with my NEC PBX. In this post, I’d like to review what went wrong, how we made things work, and what should have happened in a perfect world to make the installation quick and easy. I’m hoping that … [Read more...]
Archives for May 2014
Tightening up the VoIP firewall
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 … [Read more...]
VoIP with ATT IP Flex
Three months have past since I came up with this workaround to get Internet access over my ATT IP Flex fiber circuit. I had been limping along with Solution 4) from that post – reassign the IP address of the firewall and use analog trunks. The company that installed the PBX said … [Read more...]