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CGNAB providers where if you register with HTTP and then actually do data transfer with IAX, it'll show up as two different IP addresses when it does that and the registration server can't agree the registration server and then know that you're connecting to don't agree on what your IP address is Then your calls get rejected. So yeah, it's not just the endbound that matters anymore Any service providers that we should be aware of that this is a known issue It's especially bad with T-Mobile It is marginal at best with AT&T and it works pretty good with Verizon Very good. So those of us who are considering a consumer cellular should Should go right in the middle you might have a problem being said as a AT&T based system, okay