From the mid-1990s, as the rich-media communications concept extended beyond traditional switched networks to include Internet Protocol (IP) networks, the IMTC acted as an industry convergence point for Voice, Data, and Video over IP. At that time IMTC's efforts resulted in the promulgation of the ITU-T H.323 (packet-based video) standard, agreement on the initial Voice over IP (VoIP) Implementation Framework, and the first integrated interoperability tests involving the ITU-T T.120, H.320, H.324, H.323 standards and emerging IETF requests for comments (RFCs) such as session initiation protocol (SIP).