scope:

This ETS fits into the series of standards about audiovisual communication over the Integrated Services Digital Network (ISDN), which is introduced in the ITU-T H.200 series of Recommendations. In ITU-T Recommendations H.233 [1] and H.234 [2], the basic mechanisms for confidentiality and key exchange are specified. On top of these, this ETS specifies the confidentiality related protocol extensions needed for the establishment, modification and termination of audiovisual conferences using one or more Multipoint Control Units (MCUs).