[Serusers] Difficult NAT issues :external UAs behind NAT and internal UAs on private IPs but _not_ NATted

Greetings: I really need some fresh eyes on my ser.cfg and help with this difficult NAT issue: our internal UAs are on private IPs, registered with ser running on the border router (it has aliases for the private IP internal LANs and the public IP on which it listens). Calls between UAs on public IPs and our internal UAs (on their private IPs) work well. Calls between UAs behind NAT (from the Internet) and our internal UAs (on their private IPs) have no audio from us to them. Only private IP addresses in routes from the Internet must be rewritten for NAT; our internal UAs on their private IPs must be routed without change (which works if the foreign UA isn't behind NAT). We are running '0.8.99-dev19 openbsd/sparc' and 'rtpproxy 1.21 2004/08/13' Our 'ser.cfg', a packet dump of a call from an Internet UA behind NAT ('adams.dmp') and a segment of the logfile ('serlog') are at: http://www.cybertheque.org/sw/ser/configs All help is truly appreciated. Michael Grigoni Cybertheque Museum