[Users] VoIP tranzit proxy

Hello , Hello, I have the following situation: UA's ----> openser ----> proxy ------> international 172.19.5.0/24 172.19.5.2 172.19.5.3 traffic A.B.C.D E.F.G.H The problem is about proxy, I need a proxy which would be function as transit between openser (private IP) and a router with a public IP (it should pass the NAT too). I have tested siproxd(http://siproxd.sourceforge.net/) for the case when it sits between the openser (public IP) and the users with private IP - and it works. In the first case siproxd doesn't want to work ( neither as a transparent sip proxy), openser sends INVITE to proxy, it replies 408 Request Time Out. The question is: can RTPproxy or mediaproxy help me in this case? Or maybe there is another solution to solve my problem? -- Best regards, Ion Minzu, mailto:ion.minzu@cts.md