The point of the post is it may not be a Verizon system issue and you should also look at your local setup. It is more than just a strong wifi signal. Voice over IP is very sensitive to other network components over wifi signal strength - overall network speed (rarely a problem since requirement is quite low for VoIP), ping, and judder. Have you run your network connection through a VoIP test (not just a speed test)? Does it work on other wifi connections? If you force wifi only so you are on wifi calling only does it still not work or drop?