Chapter 9. Faxing and T38
Faxing is here to stay. Let's admit it: however much we VoIP practitioners hate fax, however much frustration we feel, most of us must deal with fax transmission. Fax is a way to transmit images via voice circuits that were not designed to work on packet networks, and is inherently difficult to implement reliably over VoIP.
T38 is a standard that mediates between SIP and fax to achieve a reliable transmission, trying to overcoming network induced problems. FreeSWITCH implements world-class T38 (and T30, traditional fax) support, and is widely used to serve from occasional to very high traffic fax communication.
In this chapter, we will cover:
- How traditional fax works on PSTN
- How fax works on VoIP
- How to configure and operate ...
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