Hi!
I never had to setup something like that so take this with a grain of salt…
Usually, one-sided audio is caused by NAT problems…
Is this a new setup? Did you ever try to use G.711u with your phones and did it work?
There is also a one-sided audio problem that affect G.722 and PJSIP… It is supposed to be resolved but as you don’t give any version information for your setup it’s impossible to know (this is the first thing you should give).
see: FPBX13 RC, G722 and 1-way audio - even to voicemail
A PJSIP debug trace would be a lot more useful…
From your current trace the only thing I found truly useful was to see you were using PJSIP…
I don’t use PJSIP so once again take this with a grain of salt but you should apparently do this to enable it:
https://wiki.asterisk.org/wiki/display/AST/Asterisk+PJSIP+Troubleshooting+Guide
Good luck and have a nice day!
Nick