ITU-T H.140 1988 Edition, November 1, 1988
A MULTIPOINT INTERNATIONAL VIDEOCONFERENCE SYSTEM
Published By:International Telecommunications Union -Telecommunication Standardization Sector (ITU-T)
This Recommendation defines a multipoint videoconference system which enables three or more videoconference sites to intercommunicate simultaneously, provided that the codecs conform to Recommendations H.120 and H.130 (§ 1, Note).
Note – Codecs conforming to § 2 of Recommendations H.120 and H.130 are in principle also applicable.