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Redux: iPhone Wi-fi calling firewall rules

Back on this thread iPhone Wi-fi calling firewall rules  there were a lot of IP addresses brought up for iPhone Calling.

Recently I noticed that my iPhone was no longer connecting to VZW Wi-Fi while at work. I did a little digging and found I needed to add the following IP addresses to our outbound firewall rule for allowing Verizon Wi-Fi calling.

As soon as I added these, BAM, my phone started connecting to VZW Wi-Fi.

These two already existed:

As a side note, some time ago, we added the following IP addresses to allow T-Mobile Wi-Fi calling as well.

Just thought I'd share.

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Re: Redux: iPhone Wi-fi calling firewall rules

I finally fixed this by enabling UPnP at my router. All security recommendations proscribe disabling UPnP, but it is apparently a requirement for Verizon WiFi Calling to function.