If you're using Xfinity or another Cable Internet provider, make sure you are not using a Cable modem with a Puma6 Chipset. Here's a list: https://www.dslreports.com/testsearch?fy=1999&q=puma6&ty=2016&typ=hardware .
These modems are problematic with real time applications like VoIP. Although some fixes have come through via firmware upgrades, they are likely to be causing issues with Wi-Fi calling traffic.
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