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ATAs FAQ & Tech Tips

Q) What is an FXS port?

The FXS port, "foreign exchange station," connects to an analog endpoint such as a phone or fax machine. The number of FXS ports typically correlates with the number of analog devices that can be interfaced with the ATA.

Tech Tip #1

Gateways provide more FXS ports than ATAs.

ATAs and gateways perform the same service; they both interface your analog and IP connections.

Different form factors, the number of ports, the power supply and other features tend to determine whether the device is called a gateway or an ATA.

Q) What is an FXO port?

The FXO port, "foreign exchange office," connects to the service provider (operator, PSTN, etc.). In an ATA, the FXO port is often used to connect to a PSTN, offering a backup system or failover should the main phone system or IP PBX stop functioning.

Tech Tip #2

FXO ports are commonly used as a PSTN failover.

Should the IP PBX fail because of a power outage or system error, the FXO port can connect to an analog telephone system.

A PSTN, or public switched telephone network, is an external analog telephone service.

Additional Tech Tips

Tech Tip #3

Small ATAs are perfect for desktop deployment.

Home offices or remote locations might benefit more from desktop ATAs than a rack mountable gateway.