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Since the vast majority of FAX machines in existence today do not have T. 38 built in, any FAX machine starts off the call as a regular analog call. If both sides of the call support T. 38, the call will still start as an analog call and in theory, will switch to T.

The T. 38 protocol was implemented to solve this business problem. This process defines how a device should communicate fax data so it can be sent over an IP network. Fax over IP partitions data from a fax into an image that can be encoded and sent over the internet in real time.

T. 38 is an ITU protocol that dictates how fax audio traverses a packet-switched network, such as the Internet or a company's LAN/WAN, reliably. In order for fax audio to traverse a packet-switched network like the Internet, the analog signal used by fax machines must be converted into digital packets.

T. 38 is an ITU protocol that dictates how fax audio traverses a packet-switched network, such as the Internet or a company's LAN/WAN, reliably. In order for fax audio to traverse a packet-switched network like the Internet, the analog signal used by fax machines must be converted into digital packets.

Faxes can't travel over a data network the same way they do across an analog connection. The T. 38 protocol helps convert the fax from an analog signal to an image, and then back to an analog signal when it arrives at its destination. Most VoIP Gateway devices and Analog Telephone Adaptors (ATAs) support the T.

Connect an extra phone line from the phone modem to your fax machine and another from the fax machine to the wall phone jack. Plug in your fax machine. Connect one phone line from the port on the fax machine labeled Line or Line In to the phone modem's phone port.

G. 711 is a more straightforward and often more cost-effective approach than T. 38 because of its ability to leverage voice data infrastructure. It is less likely to suffer interoperability issues with different vendors' products.