H.225 is a signaling protocol standardized by the International Telecommunication Union (ITU-T) that is used in H.323 networks and supports data
transmission, voice transmission and video transmission. The protocol is used for connection setup and termination as well as connection control. Within the protocol, signaling is based on Q.931. H.225 uses the RealtimeTransport Protocol (RTP) for real-time transmission of multimedia data.