was the router or any network device changed post which this has stopped working
i have seen a similar case, where i had to uncheck the checkbox "NAT is H323 Capable". I also had to manually put the IP address in the NAT window.
Can you try that out? the checkbox is also in the same page where you configure NAT.
Hello, I have this same problem.
I performed all the steps, and only succeeded by clearing the selection "NAT is H.323 compliant", but only audio transmission occurs between both ends, when I leave this option selected, I can not even connect the audio.