I made all the suggested changes above except I did not make any changes to line 1 as it's working fine directly connected to voip.ms.
I set NAT=no at voip.ms and it didn't make a difference.
As a test, I configured my router to put my ATA on the DMZ. Surprisingly, that didn't work either and still only get audio one way.
My thinking is that if the ATA can't even work on the DMZ with no firewall filtering, then I have config issues on the ATA itself and *maybe* voip.ms. Mind you, connecting directly to voip.ms on line 1 works fine.
I've documented all of my changes and nothing is working.
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