ITU-T Rec. H.230 (12/1990) � FRAME-SYNCHRONOUS CONTROL AND INDICATION SIGNALS FOR AUDIOVISUAL SYSTEMS
FOREWORD
1 Introduction
2 Procedures
    2.1 C&I codes provided in Recommendation H.221
    2.2 Other C&I codes
3 Definitions of C&I symbols
    3.1 C&I related to video
    3.2 C&I related to audio
    3.3 C&I for maintenance purposes
    3.4 C&I related to simple multipoint conferences not using MLP
4 Requirements for C&I