Rec. ITU-T H.243 (03/1993) – PROCEDURES FOR ESTABLISHING COMMUNICATION BETWEEN THREE OR MORE AUDIOVISUAL TERMINALS USING ...
FOREWORD
CONTENTS
1 Introduction and scope
2 Capabilities and “selected” communication modes
3 Initialization procedures for establishing communication between standard terminals and an MCU
    3.1 First terminal added to conference
    3.2 Second terminal added to conference
    3.3 Third terminal added to conference
    3.4 Fourth and subsequent calls added to conference
    3.5 Extension of multiple channels
    3.6 MCU-MCU interconnections
    3.7 Closure of conference
4 Video switching
    4.1 Video switching procedure
    4.2 Automatic switching and visualization-forcing
5 Numbering of terminals
    5.1 Numbering method
    5.2 Terminal-MCU interconnection
    5.3 MCU interconnection
    5.4 Identity information
6 Mode switching and data broadcast procedures
    6.1 General mode switching
    6.2 Mode switching for data distribution in multipoint conferences
7 Chair-control procedure using BAS codes
    7.1 General
    7.2 Assignment, release and withdrawal of chair-control token
    7.3 Information available to the chair-control terminal
    7.4 Video selection
    7.5 Terminal dropping by chair-control
    7.6 Withdrawal of data tokens by chair-control
    7.7 Request for floor
    7.8 Dropping the entire conference
    7.9 Dial-out facility (optional)
    7.10 Identification of token assignment
8 BAS sequencing
9 Capability exchange during a call
10 Procedure for loop detection at an MCU
11 Exceptional procedures
    11.1 A terminal connected does not indicate capability for the SCM
    11.2 Contention resolution principle
Appendix I – C&I signals defined in Recommendation H.230