In this Recommendation, the expression "Administration" is used for conciseness to indicate both a telecommunication administration and a recognized operating agency.
ITU-T H.235.3-2005 history
2005ITU-T H.235.1-2005 H.323 security: Baseline security profile Study Group 16
2003ITU-T H.235-2003 Security and encryption for H-series (H.323 and other H.245-based) multimedia terminals SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Infrastructure of audiovisual services ?Systems aspects Study Group 16