I assume you read my post? Have you ran torch on these customers to see what the actual traffic is? I believe they all use an IPSEC VPN. Should work through one layer of NAT (obviously does as you've seen), but I don't know why not also through the SM DMZ which is really NAT, not PAT. What's the term now, NAP-T or something like that is what we all call "NAT" generally.

On 10/15/2015 3:14 PM, Bill Prince wrote:
BTW - this is with the SM on the 13.4 release (FSK in this particular case).

bp
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On 10/15/2015 1:12 PM, Bill Prince wrote:

I think we have determined that the new AT&T "WiFi calling" feature will not work with double NAT (even when the customer's router is on the DMZ). This is the same behavior we've seen on T-mobile. It seems to work if the customer router is in bridge mode, or the SM is in bridge mode.



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