Hi As per the hello world Document from Onsip.orf ( getting started) iam working with Media proxy with same config i have installed OpenSER 1.1.0 with mysql 4.3 on Cent OS, open SER runnning on Public IP. I have 3 clients Client one Pulic IP Client 2 and client 3 behind NAT ( Linksys Router) Client1 - Sipura Client 2- LeadTek Client 3 my laptop X-Lite Soft Phone the problem here is, when ever iam making call between NATed Clients, some time media proxy using some time not when ever media proxy not using then one way voice and call also not disconnecting, any solution, or suggestion Ram