User Manual - Configuration Guide (Volume 3) | Chapter 2 |
Versatile Routing Platform | IP Fax Configuration |
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:
Figure VC-2-1Architecture 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.
