Hi Daniel, Yes I agree with you that kamailio is not involved in the rtp handling and forwarding but RTP Proxy does this. So I have mentioned that when my call is established then my RTP passes through the RTPProxy. The issue is that RTP is coming proper at UAC Side so no Voice Problem but may be RTP is not coming good at Phone Side that is why voice is bad at Phone SIde. Please see again my network. SIP UAC--------->Kamailio+RTPProxy------>SIP Server------->Phone And Kamailio and RTPProxy are on same machine and load is not high only one call is enough to produce this issue. It seems that this issue is with RTPProxy. Please anyone can provide me some settings or inputs on this issue. I can provide more information if required. Thanks and Regards Varun Date: Fri, 02 May 2014 11:27:09 +0200 From: Daniel-Constantin Mierla <miconda(a)gmail.com> To: "Kamailio (SER) - Users Mailing List" <sr-users(a)lists.sip-router.org> Subject: Re: [SR-Users] Voice is breaking when using Kamailio 4.1.3 Message-ID: <536364ED.4080806(a)gmail.com> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" Hello, kamailio is not involved in the rtp handling/forwarding. So either is a bad connection somewhere in the path or an issue in the client sides. Can you try with different phones? Cheers, Daniel On 02/05/14 07:49, varun pratapsingh wrote: -- Daniel-Constantin Mierla - http://www.asipto.com http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda