And so the T.38 recommendation was devised as a way to transport fax data across IP networks and overcome the problems that IP presents. More recently, Voice over IP (VoIP) has become a popular alternative to the conventional PSTN, and this has given rise to fax over IP.Ĭonventional fax machines were not designed to deal with the vagaries of IP networks that impair the data stream, such as latency, jitter and packet loss (see below). T.30 dates from before the advent of the internet. T.30 is an International Telecommunications Union (ITU) recommendation that defines the procedures for transmitting a document between two devices over the public switched telephone network (PSTN).
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