[Q] T-Mobile WIFI calling issue from behind corporate proxied-connection

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I have no T-Mobile tower reception at work, and was looking forward to the wifi calling capability to come to the rescue with this new phone/service. Unfortunately, my work wifi requires a proxy-serverort for browser connection, and once I update the wireless connection with these settings - I am able to browse fine.

Regardless of the wireless signal strength, the WiFi Calling status states : Poor WiFi signal, before timing out with REG99 error - unable to connect. I have also noticed on this phone and the HTC EVO 4G, that while on wifi at work, my download speeds (via speednet) are high (>10mbps), but nothing shows up in the upload section.

Given the above, and knowledgeable of the fact that my corporate network does shut down access to other ports - is there any workaround to enable wifi calling behind a proxied network? I have even tried to add a new APN to include the proxyort to no avail.

wifi calling from the home network works without any issues, and yes i am rooted.

TIA for any help.

Found the solution. Turns out that accessing the proxied wireless network was the root cause of the issue. We also have access to a guest network, that interestingly does not require a proxy connection to the outside world, and that works perfectly fine!

Still unanswered then, is what ports does this phone require that are being blocked by the proxy server?

I would also like to know the answer to this. I do not have access to another wifi server to test this. What is weird though is that my Sensation that I just got rid of had no issues with wifi calling on the same network, explain that!