[SR-Users] RTPPROXY not working with kamailio .

Hello I need help concerning this issue , i am creating a testing scenario to make the RTPPROXY work , where i have a server having installed on it Asterisk , running on (192.168.10.15), and another pc connected to the Asterisk server having the ip (192.168.10.17) , on this same pc i've installed RTPPROXY and managed to insert another Ethernet card to connect to a client on ip (192.168.20.3) . After connecting any client on this ip 192.168.20.* , i manage to make a call i hear the ring but no audio conversation . My RTPPROXY command is : /usr/sbin/rtpproxy -F -s udp:192.168.10.17:22222 -l 192.168.20.3/192.168.10.17 -d DBUG:LOG_LOCAL0 Thank you