In theory this should work well because the data network is designed for the transmission of data where the voice network wasn t.
T 38 compatible fax machine.
The t 38 protocol is a standard for fax machines in which the sender the receiver or both the sender and receiver are using voip.
Most voip gateways and ata s now support t 38 reliably.
Fortunately most newer fax machines utilize a newer t 38 protocol.
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.
All platforms on this page have been rigorously tested and certified as compatible with our service by our t 38 fax interoperability team.
The pap2 and the pap2t do not support the t 38 fax protocol.
Looking for a t 38 compatible device.
The t 38 protocol was designed to provide a raw data method to transmit fax s.
The gateway works by taking your fax machine s signal and converting it into an internet compatible one rather than first digitizing it into an audio signal.
Setting up your fax machine.
As a result these machines can more reliably receive faxes sent over voip.
For the g3 fax machine on an analog line this process will be transparent.
T 38 defines how to deal with faulty lost or repeated data packets.
In the diagram above both the gateway and the fax machine behind the gateway would have to be t 38 capable.
This is then sent either to a t 38 enabled end point such as fax machine or fax server or another t 38 gateway that converts it back to pstn pcm or analog signal and terminates the fax on a t 30 device.
The connection of a normal fax machine to a t 38 compatible voip connection is via an ata analog telephone adapter or a special connection on the router which must also be t 38 capable.
The t 38 recommendation defines the use of both tcp and udp to transport t 38 packets.
One solution send to newer fax machines.
That is why the t 38 protocol was implemented.
A configuration guide is included for each device we certify as t 38 fax compatible.
By default the selection for fax is already enable and set.
Log into the spa s web based setup page and click the line tab you want to setup your fax machine.
Many businesses rely on fax machines and fax machines are designed in a way that they cannot read data the same way a computer with a modem can.
T 38 is described in rfc 3362 and defines how a device should communicate the fax data.
In essence a t38 compatible service converts a fax to an image and then sends it to another t38 compatible fax device which converts the image back to an analog fax signal that can be fed into a standard fax machine.
We have compiled an extensive list of platforms and how to configure those devices to perform t 38 fax over ip foip.
A t38 compatible ip pbx or application is necessary to send fax documents over a data network to standard fax machines.
