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   
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 setup   
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-setup issues              
        V.4     Others