first of all, you were not that clear in your previous suggestions.
this is the first time that you give me exact command to turn on debugs that are required.
I will try these and try to see what’s wrong in SDP, codecs etc.
about “incorrect network conf. /NAT” :
I’m sure this is not the case. I told you the reasons. there is no nat.
but still I don’t know what is a "good network configuration"
is there a clear example of this ?
about “router on remote end mangling packets” :
I have a working Asterisk+FreePBX configuration , using the same remote end. The new setup is just newer Asterisk on new OS.
So the problem can not be about remote end.