Software installation ===================== As operating system we have choosen Debian Jessie, since all the software components we use provide packaging for it. OpenSIPS_ --------- We got OpenSIPS_ installed via following commands: :: apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 049AD65B echo "deb http://apt.opensips.org jessie 2.2-releases" >>/etc/apt/sources.list apt-get update apt-get install opensips opensips-json-module opensips-restclient-module Once installed we proceed with loading the configuration out of specific tutorial cases bellow. .. _OpenSIPS: http://www.opensips.org/