[Serusers] rtpproxy - voice problem

Hi everybody, I have managed (finally) to build a Sip proxy server for my studies, using SER 0.9.6 , with MySQL support , but I am facing a problem. Everything works fine with the softphones I use, exept the voice.The registration works fine, the IM works fine, but when a user is trying to speak to the other, something is wrong(only in my local network, without NAT, the voice communication is working). My laptop, in which I have installed SER , is behind a router.(My ser.cfg supports Nathelper module). 1)Should I connect it directly with public ip ? 2)I tried to use rtpproxy, but I am a little bit confused. Can I install it in the same machine ? What are the parameters of rtpproxy ? I have attached my ser.cfg Any help will be appreciated Dimitris - Greece