[Serusers] Openser bridging

Hi Folks, I'm still struggling with bridging openser between a public and a private network. The private 10.10.12.0/24 network connects openser and an asterisk server that plays a file and hangs up. I've got 2 sip clients connected to the public and private sides of the openser server. When I make calls via openser to the asterisk box, I only get audio on the private networks sip client, and neither client gets hung up correctly at the end of the call. I've put the SIP debug from the external client here: http://pastebin.com/m388a707d My openser and rtpproxy configs are here: http://pastebin.com/m3ed309d3 Can anyone give me any pointers? I've been staring at this for days :( -Cheers Max