I have been using PAP2 over 5 years. I have seen this one-way audio issue going and coming.
My present fix is to use pbxes (since my voxalot is basic, doesn't offer forward out service). Seems this way works years.
PAP2 is a discontinued product, a little bit old. it's NAT feature is either out-of-day or too weak. If you have two PAP2 behind the same router, the problem will be more serious.
I was testing other (newer) SIP phones and didn't encountered the one-way audio problem.
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