CONTENTS

 1     Scope 
 2     References 
        2.1     Normative References       
        2.2     Informative References      
 3     Definitions  
 4     Conventions     
 5     Prose descriptions           
 6     Functional model and service profile         
        6.1     Functional model   
        6.2     Service model        
        6.3     Service profiles      
 7     Service scenarios 
        7.1     Business videotelephony service scenarios  
        7.2     Residential videotelephony service scenarios           
 8     IP videotelephony service requirements    
        8.1     User requirements  
        8.2     Application requirements    
        8.3     Security requirements         
        8.4     Authentication and accounting requirements
        8.5     Interworking and intercommunication requirements 
        8.6     QoS requirements