We are installing a Cradlepoint 4G backup internet for your Cox Fiber which has a static ip address. The Cradlepoint device goes in-line between our router and the fiber modem. When Cradlepoint senses loss of fiber internet, it automatically switches over to supply 4G internet to our router. Only…

[image] Redundancy for customer with 2 ISPs Networking This is a good and straightforward solution with one catch. If you are using FreePBX’s NAT handling (most people do), then FreePBX needs to know about its external IP. If failover is infrequent and not “flappy” then a…

Cool thanks, I’ll tinker with this! I don’t know much about SIP ALG, except all the posts saying to turn it off or face certain misery. I assume I would turn off FreePBX NAT handling somehow if I went the router SIP ALG route?

The ALG would look at SIP traffic crossing the NAT (your router) and adjust it with internal IP addresses for traffic heading inside and the external IP for traffic heading out. That’s the idea, but test it and make sure it works correctly. The scripted IP check solution works using your current Fre…

Thank you everyone! Just to clarify, the sip nat setting in freepbx can’t accept a FQDN?

No, they can’t have a ‘Fully Qualified Domain Name’, they can have a ‘Qualified Domain Name’ which could be provided by your local Name Service in your local network Domain and propagated by your DHCP server. But that is a specious argument as Private namespace is not route-able on the internet

NAT External IP address that changes if using backup internet

FreePBX Networking

billsimon (Bill Simon) April 8, 2022, 2:04pm 2