If you are looking for SIP based calling, they SIP and RTSP can be used. gst-launch-1.0 videotestsrc is-live=true ! x264enc tune=4 key-int-max=60 ! h264parse ! rtph264pay ! udpsink clients=<multicastIp:port> multicast-iface=<iface> -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/