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User Manual - Configuration Guide (Volume 3)
Versatile Routing Platform
Chapter 2
IP Fax Configuration
2-1
Chapter 2 IP Fax Configuration
2.1 Overview to IP Fax
Traditional faxes are sent and received over PSTN. Today fax services are widely used
due to its advantages, such as many kinds of transmissive information, fast speed for
information transmission and easy to use. Type G3 facsimile machines are frequently
used fax terminals in the current fax communications. Type G3 fax is a communication
equipment with digital signal process technology. In the process, image signal is turned
into analog signal through a modem after it is digitized and compressed, then the
analog signal is input into switch via general subscriber line.
The so-called IP Fax, just as its name implies, indicates that fax is sent and received
over Internet. Quidway series router can provide VoIP function. With the features of IP
Fax, it also can offer IP Fax functions. IP Fax can provide PSTN subscribers with
Internet fax services, thus the subscribers only need to pay for considerable cheap
expenses when sending international and domestic faxes.
The diagram of IP Fax architecture is as follows:
PSTN
PSTN
Internet
Router
Router
Figure VC-2-1 Architecture of IP Fax
IP realtime fax complies with ITU-T T.30 and T.4 protocols on the side of PSTN and
complies with H.323 and T.38 protocols on the side of IP. T.30 protocol is the
transmission protocol and recommendation for the document fax in the Public Switched
Telephone Network (PSTN). It has made detailed description and rules on the
communication process, the signal format adopted in communication, control signaling
and error correction mode of category 3 facsimile over PSTN network. T.4 protocol
regulates the related standards and specifications for the file transmission through
category 3 facsimile terminals. It has made the standardization rules on image coding
mode, signal modulation mode and rate, transmission time, error correction mode as
well as file transfer mode of the category 3 facsimile terminal. T.38 protocol stipulates
the recommendations and specifications for the realtime communication through
category 3 facsimile terminals over IP network. It has made some description and rules
on the communication mode, packet format, error correction and some communication
process of the category 3 facsimile over IP network.
2.2 Configuring IP Fax
2.2.1 Task List of IP Fax Configuration
You should configure VoIP before configuring IP Fax. For the detailed procedure of
VoIP configuration, please refer to the section “Chapter 1 VoIP Configuration” in the
manual.