[Users] audio problem in NAT helper..

Hi Users, I'm cracking my head with audio problem.. I installed openser 1.0.1 in Linux + freeRadius + RtpProxy + mysql When I make a call ( which are behind the nat ) the audio is not hearing and audio signal of Softphone is blinking up and down.. In Debug output I didn't see any SIP reply or sip request for ACK.. I thing so that, If client nehind the NAT didn't receive the ACK. this may be problem... SIP/2.0 200 Ok v: SIP/2.0/UDP 192.168.2.21:5060;received=61.17.248.68 ;rport=4007;branch=z9hG4bK9615579CC17F47929BB2FEF3F33F4BFC f: ravi <sip:1003@24.98.157.209>;tag=145161195 t: <sip:104@24.98.157.209>;tag=641313084 m: <sip:104@61.17.248.68:5060> Record-Route: <sip:192.168.2.4;ftag=145161195;lr=on> i: 839BBA5C-84B5-4D09-ACF1-B19FA0EB3C59(a)192.168.2.21 CSeq: 54483 INVITE c: application/sdp Server: X-Lite release 1105x Content-Length: 166 v=0 o=104 86794725 86799157 IN IP4 192.168.2.20 s=X-Lite c=IN IP4 192.168.2.4 t=0 0 m=audio 35034 RTP/AVP 1 a=rtpmap:1 pcmu/8000 a=sendrecv a=nortpproxy:yes --------------------- > this is problem openSER server didn't get request ACK I think So.. What may the problem... plz help me -- Thanks and Regards w ith cheers Sunkara Ravi Prakash (Voip Developer) Hyperion Technology www.hyperion-tech.com