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I came across this post because I was having a similar problem with GV at home.  My calls would connect but neither side was getting any audio.  I checked my Intrusion Detection alerts and found this rule being triggered on my devices using GV:

2033078 - ET INFO Session Traversal Utilities for NAT (STUN Binding Request On Non-Standard High Port)

After disabling that rule GV seemed to start working normally again.