Bogdan-Andrei Iancu,hello Ask for you again. :) I am succesful on openser for TLS connected by SIPp,but not minisip :( thanks for your more help! Now I step to srtp! Can I use SRTP to build peer to peer communication from openser? if outbound via openser.or do you learn more about srtp of SIP. Best Regard! Kenny from China Shanghai 2006-1-5