HI Benny, We were able to receive the encrypted packets at the receiving endpint by calling encrypt_decrypt(pkt+12,pkt+12,key); and thus skipping the rtp header but there is kinda cracking noise and we still hear the words I think there is a little problem with the encryption algorithm but I am testing it. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20071003/41afcc85/attachment-0001.html