Hi,
Maybe you can check the contact of INVITE from sip proxy to callee. Try fix_contact () for INVITE.
The contact is fixed for INVITE. Also, replies are routed according to the Via-Header, so this isn't the issue.
What I've found out in the meanwhile is, that it's the use_media_proxy() in the reply-route which causes the problem. If I comment this line, the 200-OK is routed without problems (but there's one-way-audio, obviously). Any hints in that direction?
Regards, Andreas