ITU-T Rec. H.243 (03/1996) – Procedures for establishing communication
between three or more audiovisual terminals
using...
Summary
Source
FOREWORD
CONTENTS
1 Scope
2 References
3 Conventions
4 Capabilities and "selected" communication modes
5 Initialization procedures for establishing communication between standard terminals and an MCU
5.1 First terminal added to conference
5.2 Second terminal added to conference
5.3 Third terminal added to conference
5.4 Fourth and subsequent calls added to conference
5.5 Extension to multiple channels
5.6 Other standard terminals
5.7 MCU-MCU interconnections
5.8 Closure of conference
5.9 User-initiated connection establishment
6 Video switching and mixing
6.1 Video switching procedure
6.2 Video mixing
6.3 Automatic switching and visualization-forcing
7 Numbering of terminals
7.1 Numbering method
7.2 Terminal-MCU interconnection
7.3 MCU interconnection
7.4 Terminal identity information
8 Mode switching and data broadcast procedures
8.1 General mode switching
8.2 Mode switching for data distribution in multipoint conferences
9 Chair-control procedure using BAS codes
9.1 General
9.2 Assignment, release and withdrawal of chair-control token
9.3 Information available to the chair-control terminal
9.4 Video selection
9.5 Terminal dropping by chair-control
9.6 Withdrawal of data tokens by chair-control
9.7 Request for floor
9.8 Dropping the entire conference
10 BAS sequencing
11 Capability exchange during a call
12 Procedure for loop detection at an MCU
13 Exceptional procedures
13.1 A terminal connected does not indicate capability for the SCM
13.2 Contention resolution principle
14 MCU loopback procedures
15 Interactions with T.120 control
15.1 Chair-control interactions
15.2 Interactions with passwording
15.3 Interactions with TIX/TIA
15.4 Interactions with SCM management
15.5 Rate matching in a cascade
Appendix I – C&I signals defined in H.230