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Thanks for the reply. I am aware what 1e100.net does, but I would like to know if this is absolutely necessary for a PBX that is locked down at my perimeter firewall to only talk with the ITSP.

I've been playing around with a couple of IncrediblePBX13 Raspi installs and I have noticed that it is contacting different 1e100.net hosts on random UDP ports. I noticed this when I was debugging an inbound call from my ITSP. If I lock the PBX down with my perimeter firewall so that it can...

Thanks @Eliad. I have this setting set in pfSense too, but I find for this particular application that the downtime during re-registration is unacceptably slow. Having two trunks registered over different links and getting the ITSP to do the failover is IMO an efficient way to reduce the trunk...

Thanks for your reply. I am in Australia and my provider is Maxotel. Yes, I also have two static IP's. The very problem is that I can't send two different registrations to the same host and port from the same PBX through two WAN's. I have played with a second IncrediblePBX on a Raspberry Pi...

I'm hoping that someone might be able to help me with some ideas here. I have an IncrediblePBX that is successfully running behind a pfSense firewall. It has been working for many years. I have two WAN's and there is failover configured. The failover works and the PBX trunks eventually...