CONTENTS

 1     Scope  
        1.1     Block diagram and functional elements    
        1.2     System elements outside the scope of this Recommendation        
        1.3     Functional elements covered by this Recommendation    
 2     References
        2.1     Normative references        
        2.2     Informative references      
 3     Definitions
 4     Abbreviations and acronyms       
 5     Conventions     
 6     Functional requirements 
        6.1     Required elements
        6.2     Information streams          
        6.3     Modem   
        6.4     Multiplex  
        6.5     Control channel    
        6.6     Video channels      
        6.7     Audio channels     
        6.8     Data channels        
 7     Terminal procedures       
        7.1     Phase A – Call set-up of voiceband channel          
        7.2     Phase B – Initial analogue telephony communication       
        7.3     Phase C – Establishment of digital communication, modem training       
        7.4     Phase D – Initialization     
        7.5     Phase E – Communication            
        7.6     Phase F – End of session  
        7.7     Phase G – Supplementary services and call clearing         
 8     Interoperation with other terminals         
        8.1     Speech only terminals       
        8.2     ITU-T H.320 multimedia telephone terminals over the ISDN      
        8.3     Multimedia telephone terminals over mobile radio           
 9     Optional enhancements   
        9.1     Data facilities        
        9.2     Encryption
        9.3     Multilink
10     Multipoint considerations          
       10.1     Establishment of common mode 
       10.2
     Multipoint rate matching 
       10.3     Multipoint lip synchronization    
       10.4     Multipoint encryption      
       10.5     Cascaded MCU operation
11     Maintenance   
       11.1     Loopbacks for maintenance purposes      
Annex A – Protocol stack for control channel     
        A.1     General  
        A.2     SRP mode
        A.3     LAPM/ITU-T V.42 mode 
        A.4     WNSRP control frame signalling on the control channel 
Annex B – HDLC frame structure transparency for asynchronous transmission     
Annex C – Multimedia telephone terminals over error‑prone channels     
        C.1     Abstract 
        C.2     General  
        C.3     Changes to procedures     
        C.4     Interworking         
        C.5     Terminal procedures         
        C.6     Initialization of multiplex level at the start of a session   
        C.7     Dynamic change of level or option during session           
        C.8     Control channel definition for mobile terminals  
Annex D – Operation on ISDN circuits (H.324/I)     
        D.1     Scope     
        D.2     References
        D.3     Definitions           
        D.4     Functional requirements  
        D.5     Terminal procedures         
Annex E – Timer T401 initialization for operation over geostationary-satellite channels     
        E.1     Introduction          
        E.2     Determination of timer value       
        E.3     Timer tuning procedure    
Annex F – Multilink operation     
        F.1     Scope     
        F.2     References
        F.3     Functional requirements   
        F.4     Overview  
        F.5     Procedures
      Page
        F.6
     Maximum transmit skew  
        F.7     Sequence diagram for establishment of multilink operation         
Annex G – Usage of ISO/IEC 14496-1 generic capabilities in ITU-T H.324 terminals     
        G.1     Scope     
        G.2     References
        G.3     General  
        G.4     Choice of error protection for ISO/IEC 14496 data streams        
        G.5     Framing of ISO/IEC 14496-1 data streams          
Annex H – Mobile multilink operation     
        H.1     Scope     
        H.2     Definitions and format conventions         
        H.3     Functional requirements  
        H.4     Overview 
        H.5     Mobile multilink layer specification        
        H.6     Procedures            
        H.7     Header modes       
Annex I – Usage of HTTP generic capability in ITU-T H.324 terminals     
        I.1        General
        I.2        Logical channel for HTTP          
        I.3        HTTP generic capability 
        I.4        References          
Annex J – ASN.1 OIDs defined in this Recommendation     
        J.1        Summary of OIDs defined in this Recommendation       
        J.2        Session reset capability identifier            
Annex K – Media oriented negotiation acceleration procedure     
        K.1     Abstract 
        K.2     General  
        K.3     References
        K.4     Definitions and format conventions         
        K.5     Terminal procedures         
        K.6     MONA signalling 
        K.7     Channel establishment method negotiation          
        K.8     Channel establishment via the signalling preconfigured channel (SPC)   
        K.9     Preconfigured channel establishment       
       K.10     Accelerated ITU-T H.245 procedures     
Annex L – Text conversation in ITU-T H.324     
        L.1     Introduction          
        L.2     Scope     
        L.3     Definitions
        L.4     Procedures for ITU-T T.140 text conversation     
        L.5     Framing and buffering of ITU-T T.140 data         
        L.6     Presentation considerations          
Annex M – ITU-T H.245 messages used by ITU-T H.324 endpoints     
Appendix I – Bit and octet order     
Appendix II – ITU-T V.8 bis codepoints