My workplace has very weak mobile signal strength (due mainly to its location). I am able to activate and use WiFi calling at home on my Samsung S8, so I know it works, but not in the office on the company network. I spoke to an IT guy who suspected that the necessary ports and/or protocols to allow WiFi calling may not be open.
Does anyone know what the specific requirements are (IP address, protocol, port numbers), so that I can see if they can be enabled?
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Cheers,
            James