[Ata] Fax Configuration - AT&T SB67030 Administrator's Manual

[ATA] Fax Configuration

A fax machine can be connected to one of the FXS ports on the ATA, as shown in Figure 105. Incoming fax transmissions are
routed from a telephone connection on the Gateway over your LAN and through the ATA to your fax machine. Similarly, faxes
travel from your fax machine through the ATA and over the LAN to the Gateway for transmission to the far-end fax machine.
A telephone line must be selected as the fax line. This is done in Fax Configuration in the WebUI. The fax can be assigned to
any telephone number, but if you have a hunt group (a telephone company feature that allows calls to a busy phone number to
roll over to the next available telephone number), you should use the last phone number in the hunt group, (the numbers are
seized in ascending order) so that the fax number is less likely to receive incoming voice calls. PSTN Gateway users can minimize
the likelihood of using the fax line for outgoing voice calls (which could interfere with reception and sending of faxes) by using
the highest numbered PSTN telephone port on the PSTN Gateway.
The ATA supports two modes for fax transmission: G.711 and T.38.
G.711 is a pass-through method that is the older, simpler fax protocol. G.711 mode provides the best compatibility with
most fax machines and therefore is the default mode.
T.38 is the standard protocol for faxing over IP networks and is more resistant to network impairments. However, users
will not hear Call Progress Tones (CPT) such as ringback and busy signals. Fax machine compatibility issues are common.
T.38 is not available if the fax telephone number is through the T1 Gateway.
The best mode for your installation depends on both
your fax machine and your telephone line. In case of
any fax issues, see "[ATA] SB67050 ATA
Troubleshooting" on page 245
Use the WebUI to specify the Gateway and line being
used as the fax line.
System Configuration
Synapse Administrator's Guide
for more details.
Figure 105. Fax Machine Connected to FXS Port
108