Abstract: A system, method, and streaming gateway for delivering a video stream between an IP Multimedia Subsystem (IMS) endpoint in an IMS domain and an Internet endpoint in an Internet domain. The streaming gateway sets up sessions in both the IMS and Internet domains. The IMS endpoint sends the video stream to the streaming gateway utilizing the Session Initiation Protocol (SIP) and Real Time Protocol (RTP), and the streaming gateway forwards the video stream to the Internet endpoint using an appropriate Internet protocol such as the Real Time Streaming Protocol (RTSP). The streaming gateway may also stream another video stream such as a promotional video to the Internet endpoint while waiting for the video stream from the IMS endpoint to become available.