CONTENTS

1 Scope
2 Normative references
3 Definitions
4 Abbreviations
5 Introduction
6 Communication between gateways
6.1 Internet protocol TCP or UDP
6.2 Gateway facsimile data transfer functions
6.2.1 Treatment of non-standard facilities requests
7 IFT protocol definition and procedures
7.1 General
7.1.1 Bit and octet transmission order
7.1.2 Mapping of the T.30 bit stream
7.1.3 IFP Packet Layers for TCP/IP and UDP/IP
7.2 IFP packet format
7.2.1 T.38 packet
7.2.2 TYPE
7.2.3 DATA-Field
7.3 TYPE definitions
7.3.1 T30_INDICATOR
7.3.2 T30_DATA TYPE
7.4 The IFP DATA element
8 IFP message flow
8.1 Data rate management method 1
8.2 Data rate management method 2
9 IFT over UDP transport: IFT/UDP
9.1 Overview of UDPTL protocol
9.2 UDPTL header section format
9.2.1 UDPTL sequence number element
9.3 UDPTL payload section format
9.3.1 UDPTL FEC message format
9.4 IFP/UDP facsimile data transfer functions
9.4.1 Use of redundancy messages
Annex A ASN.1 notation
A.1 ASN.1 notation
Annex B Call establishment procedures
B.1 Communication between facsimile terminal and gateway
B.2 Transfer of addressing information
B.2.1 From calling terminal to gateway
B.2.2 Communication between gateways
Annex C The optional forward error correction scheme for UDP
C.1 Overview of the optional forward error correction mechanism
C.1.1 Parity encode/decode scheme operation and characteristics
C.1.2 Generating and transmitting FEC messages
C.1.3 Receiving FEC messages and primary reconstruction
Appendix I Session examples
I.1 Session examples
I.1.1 Two traditional facsimile devices communicating using ECM
I.1.2 Traditional facsimile device and Internet-aware facsimile device
I.1.2 Two traditional facsimile devices using frequent frames