Table of Contents

 1     Scope          
 2     Normative references          
 3     Definitions 
 4     Abbreviations and acronyms             
 5     Introduction             
        5.1     Conventions  
 6     Communication between gateways               
        6.1     Internet protocol – TCP or UDP             
        6.2     Gateway facsimile data transfer functions        
 7     IFT protocol definition and procedures         
        7.1     General            
        7.2     IFP packet format        
        7.3     TYPE definitions            
        7.4     The IFP DATA element              
        7.5     Limitation of ITU-T V.21 frame packet size        
 8     IFP message flow for facsimile modulations up to ITU-T V.17              
        8.1     Data rate management method 1        
        8.2     Data rate management method 2        
 9     IFT over UDP transport        
        9.1     IFT over UDP transport using UDPTL protocol: IFT/UDPTL/UDP               
        9.2     IFT over UDP transport using RTP protocol: IFT/RTP/UDP          
10     Message flow for ITU-T V.8 signals and Annex F of ITU-T V.34 facsimile        
       10.1     ITU-T V.8 negotiation
       10.2     ITU-T V.34 data rate management      
       10.3     Facsimile mode           
       10.4     Compatibility with equipment conforming to prior versions of this Recommendation    
11     Security considerations      
Annex A – ASN.1 notation    
        A.1     ITU-T T.38 (2002) ASN.1 notation          
        A.2     ITU-T T.38 (1998) ASN.1 notation          
Annex B – ITU-T H.323 call establishment procedures    
        B.1     Introduction  
        B.2     Communication between facsimile terminal and gateway        
        B.3     Communication between gateways    
Annex C – The optional forward error correction scheme for UDPTL    
        C.1     Overview of the optional forward error correction mechanism              
        C.2     Parity encode/decode scheme operation and characteristics  
Annex D – SIP/SDP call establishment procedures    
        D.1     Introduction  
        D.2     Communication between gateways   
Annex E – ITU-T H.248.1 call establishment procedures    
        E.1     Introduction   
        E.2     Communication between gateways    
Annex F – Interworking procedures: ITU-T T.38 and ITU-T V.150.1 in the same gateway    
        F.1     Introduction   
        F.2     SSE reason identifier codes for ITU-T T.38 transition     
        F.3     Mode override from ITU-T V.34 Group 3 facsimile to standard Group 3 facsimile            
        F.4     External signalling        
Annex G – ITU-T H.245 capability definition for ITU-T T.38 over RTP    
Annex H – Signalled and provisioned ITU-T T.38 protocol parameters    
        H.1     Introduction  
        H.2     Transport conditional ITU-T T.38 parameters  
        H.3     Guidelines for signalling ITU-T T.38 protocol parameters           
        H.4     Legacy Interpretation of SDP Parameters         
Appendix I – Session examples    
        I.1                   Session examples           
        I.2                   IAF device          
Appendix II – Examples of call establishment procedures described in Annex B of ITU‑T T.38    
       II.1     Sequence examples of call establishment procedures 
       II.2     Protocol data used in call establishment procedures    
Appendix III – ITU-T H.248 call establishment procedure examples for facsimile-capable media gateways    
      III.1     Introduction   
      III.2     Examples of call set-up              
Appendix IV ITU-T V.34 session examples    
       IV.1     ITU-T V.34 session examples 
Appendix V ITU-T T.38 implementation guidelines    
        V.1     General issue
        V.2     IAF issues       
        V.3     Call set-up issues         
        V.4     Others             
      Page
Appendix VI – Security considerations from a historical perspective    
       VI.1     Historical origin and use of Recommendation ITU-T T.38           
       VI.2     Application vs network/transport level security            
Bibliography