Luckily I don't have to work with you, theartiszan, because I'd ask you to leave for not investigating a very clear technical demonstration and examination of a problem. The information requested in the personal message was irrelevant. This is also hardly the first occurrence of this problem.
T-Mobile : Thanks to whomever fixed the server(s) at 206.29.177.36. I got no WiFi calling errors today and hitting 206.29.177.36 manually now returns the cert that the phone is looking for.