opensips source code for ubuntu 12.04 i try this by myself

安装Opensips的步骤及公网环境搭建-Opensips installation steps and public network environment to build

通过vpn方式加密使用opensips，可文字、语音和视频聊天！(Vps and vpn and opensips Through VPN encryption using opensips text voice and video chat buy a vps than build vpn and bulid opensips enjoy it)