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 ITU-T Rec. H.230    
Appendix II – Mandatory and optional codes for MCUs