VoLTE not working with VPN. Help?
 

We have some iPhones supervised with MDM which use an always on VPN that cannot be disabled. It seems that VoLTE doesn't work right with this setup. When trying to make a call the phone hangs for like 20 seconds after which point it'll either die saying 'call failed', pretend to connect but there's...

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Courtesy of WestNet Wireless
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