[SR-Users] RTPProxy/Mediaproxy issue

Dear Kamailio'ns, I have configured kamailio (V 4.0) with RTPproxy server. Audio/Video call establishments are just fine. With this i have some unknown behaviour in my set-up is that When i am running kamailio server with RTPproxy instance, i am experiencing Jitter, Latency, pixelled audio/video calls. But when i run only Kamailio server without RTPproxy service running, audio/video calls are just fine (no any jitter, latency kind of issues). I also tried with Mediaproxy (AG projects) server but the results are same as like in Kamailio/RTPproxy case. What could be the problem with this set-up ? How can i solve this issue ? Please anybody help me in resolving this problem. Any help will greatly appreciate. Regards. Ravi.