Floreat's Fax over IP Software and Group 3 Fax Modem Protocols
FoIP and Fax Modem Protocols:		Floreat Software Fax Modems (FloFax):
ITU-T T.38                   Real Time Fax over IP Software ITU-T T.37                   Store and Forward Fax over IP Software ITU-T T.30                   Group 3 Fax Protocol Software ITU-T T.30E                 Color Fax Protocol Software ITU-T T.4                      G3 Fax Image Format of Document Tx. ITU-T T.6                      MMR Compression Software ITU-T Class 1, 2.0      Fax Modem Service Class		ITU-T V.34 Fax SoftModem        33.6 Kbps – 2.4 Kbps ITU-T V.17 Fax SoftModem        14.4 Kbps – 7.2 Kbps ITU-T V.29 Fax SoftModem        9.6 Kbps and 7.2 Kbps ITU-T V.27ter Fax SoftModem   4.8 Kbps and 2.4 Kbps ITU-T V.21ch.2 Fax SoftModem 300 bps back channel

T.38 Real Time Fax over IP Protocol Software (T.38 FoIP Software) To become an integral part of the Universal Messaging infrastructure, real time IP fax must be based on accepted industry standards. T.38 is the ITU-T standard governing real-time fax relay over IP networks. It was ratified in 1998 by Study Group 8 of the ITU. It defines procedures to allow Group 3 fax transmission between terminals when a portion of the path includes an IP network. The architectural framework of the T.38 recommendation is to have a traditional Group 3 fax terminal connected to a gateway/router which encodes the fax signal into IP fax packets and sends the signal through an IP network to a receiving gateway which decodes the IP fax packets into fax signals and makes a PSTN call to the facsimile equipment on the other side. Another scenario is the connection at either end to a fax enabled device like a PC directly connected to an IP framework. Fax could be transported by networks without a relay engine provided the network is very high performance with low packet loss, delay and jitter. But in an imperfect real world, the use of T.38 compliant relay enables the gateway to withstand problems of network impairments without creating errors in the received image. Products claiming compliance with H.323 must support T.38. The T.38 standard is crucial to building a framework of real-time Fax over IP. Real-time fax over IP used instead of or in combination with store and forward fax gives users the same satisfaction they get from fax machines along with substantial cost savings. T.38 then produces clean faxes but presents inter-operability problems that any service provider would face if it intends to use T.38 capable gateways from multiple vendors. Any T.38 solution must also have addressed these interoperability issues. An internet aware facsimile device would have the T.38 implemented within the device itself. Thus the user could send and receive faxes via a PSTN or send and receive Real-time T.38 faxes via the Internet or make copies of documents. Any two G3 fax devices communicate with each other over the PSTN. The protocols inside the fax machine consist mostly of the T.4 image protocol, the T.30 state machine and the different V.xx Group 3 fax modems. The gateways in the IP network case must act as they are fax machines. The G3Fax devices only understand the T.30 state machine and T.4 related data. This means that the gateway must have the exact same protocols as the fax machine that it is connected to, but it must also contain a part to be able to communicate this data over the IP network. The T.38 specifies two ways of doing this, TCP or UDP. T.38 specifies a special kind of layer such that the T.38 messages exchanged for TCP and UDP look identical. The Internet Fax Protocol (IFP) packets are wrapped inside a TCP header. These are then wrapped inside an IP header. Error checking is built into the TCP protocol. The IPF protocol conforms to the HDLC frames format used by the T.30 protocol, every T.30 message has been mapped into a corresponding T.38 IFP message, so a G3 Fax device will not know that it is not communicating directly with another G3 Fax device. Floreat’s T.38 Fax over IP (Fax Relay) software provides reliable real-time fax service between two analog fax machines over an IP network. Floreat’s T.38 software provides a fully compliant implementation of the ITU-T T.38 Fax Relay Protocol for real-time Group 3 fax communications over IP networks. Floreat’s T.38 software permits end-users to send a fax over the PSTN from a PSTN-connected fax terminal to any T.38-supporting gateway, then over an IP network to another such terminal using Floreat’s T.38 software, to finally terminate in an IP-media server or a PSTN receiving fax terminal. Features: All required features of ITU-T T.38 along with the data pump, which includes V.34, V.17, V.29, V.27ter, V.21ch.2 T.30 and T.4 control protocols Multiple channel capability, code is modular, re-entrant and re-locatable UDP and TCP modes of packet-transfer Interoperability tested using wide variety of commercial fax machines and with Genoa software simulating 100+ fax machines Third Party Compatibility for TCP and UDP transport modes Handles IP network impairments such as lost packets, network delay, jitter (variable delay) C-Code facilitates porting to different platforms Available with fully integrated and tested Fax Modem or just as a Fax Relay Protocol Software Engine Floreat’s Fax modem protocols are modular, re-locatable and re-entrant to support multi-channel capability. This protocol software can operate within a multi-tasking environment or as a single task and it is supported on various DSPs and processors as well as offered in fixed and floating point C. Floreat’s fax Modem protocols can be integrated with Floreat’s other data modem, telephony, speech compression, VoIP, FoIP, imaging and video software for various applications. T.38 Real Time Fax over IP Protocol Software (T.38 FoIP Software) printable pdf version Top Floreat’s FloFax Software Floreat’s FloFax includes all the fax modulation standards that are listed as requirements for the Group 3 Facsimile. This includes the following: 1) V.21 (300bps) recommendation which uses FSK (Frequency Shift Keying), in which different frequencies represent binary data. V.21 speeds are used to exchange initial capabilities of two fax machines but not to send the fax image 2) V.27ter (2400 and 4800 bps) which uses DPSK (Differential Phase-Shift Keying) in which phase differences are used to encode bits 3) V.29 (9600 bps with fallback of 7200 bps) that incorporates QAM (Quadrature Amplitude Modulation), amplitude modulation with phase shifts, and is used to transmit image data 4) V.17 (14400 bps with fall-back to 12000 bps, 9600 bps, 7200 bps), which uses TCM (Trellis Coding Modulation) that enhances reliability and supports high speeds so that this modulation scheme is used to transfer images 5) V.34 (33600 bps), which uses TCM constellations, echo-canceling and line-probing to achieve the high speeds that make it suitable for color fax transmission Floreat’s FloFax modem software is modular, re-locatable and re-entrant to support multi-channel capability. These fax software modems can operate within a multi-tasking environment or as a single task and it is supported on various DSPs and processors as well as offered in fixed and floating point C. Floreat’s Fax Modem software an be integrated with Floreat’s other data modem, telephony, speech compression, VoIP, FoIP, imaging and video software for various applications. Floreat’s FloFax Software printable pdf version Top Floreat Group 3 Fax over IP Software (G3 Fax over IP Software) package (real time): V.17, V.29, V.27ter, V.21 ch.2, T.30, T.38 Floreat Group 3 Fax over IP Software (G3 FoIP Software) package (store and forward): V.17, V.29, V.27ter, V.21 ch.2, T.30, T.37 Floreat Color Super Group 3 Fax Modem Software (Super G3 Fax Software) package: V.34 Fax, V.17, V.29, V.27ter, V.21 ch.2, T.30, T.30E Floreat Super Group 3 Fax Modem Software (Super G3 Fax Software) package: V.34 Fax, V.17, V.29, V.27ter, V.21 ch.2, T.30 Floreat Group 3 Fax Modem Software (G3 Fax Software) package: V.17, V.29, V.27ter, V.21 ch.2, T.30 Floreat Group 3 Fax Modem Software (G3 Fax Software) package (end to end): V.17, V.29, V.27ter, V.21 ch.2, T.30, T.4, T.4 to Tiff conversion

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