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Analog Telephone Adapter Selection Guide

Generally Analog Telephone Adapters (ATA's) are used by people to connect to a voice over IP service provider (telephone company). ATA's are used to connect analog telephones (or telephone lines) to newer voice over IP phone systems and service providers. These small boxes convert the analog signal of your phone into voice over IP which then uses the data network to send the call.

There are two types of ATA's, the most popular is used to connect an analog telephone to a service provider. These ATA's have one or two FXS ports (station) for connecting analog telephones or fax machines to. Other ATA's contain one or more FXO ports (office) for connecting analog telephone lines to.
These are small devices, usually about the size of a pack of cigarettes, will also have one or more Ethernet jacks for connecting to your IP PBX system. Device configuration is usually via a built-in web interface.

Analog Adapters with 1 FXS Port Analog Adapters with 2 FXS Ports
ATA devices with a single FXS port for connecting a single analog telephone to your IP PBX system.

 
ATA devices with two FXS ports for connecting a two analog telephones to your IP PBX system.

 
Analog Adapters FXO + FXS Ports AudioCodes Analog Adapters
ATA devices with both FXO and FXS ports that can be used to connect analog phone lines and analog telephones to your IP PBX system.

 
ATA adapters from AudioCodes for connecting via SIP to your IP PBX system.

Cisco Analog Adapters Digium Analog Adapters
ATA adapters from Cisco for connecting via SCCP, MGCP & SIP to your IP PBX system.

ATA adapters from Digium that use the IAX2 protocol to connect to trixbox & Asterisk IP PBX systems.

 
Grandstream Analog Adapters Linksys / Sipura Analog Adapters
ATA adapters from Grandstream for connecting via SIP to your IP PBX system.

ATA adapters from Linksys for connecting via SIP to your IP PBX system.

Mediatrix Analog Adapters ZOOM Analog Adapters
ATA adapters from Mediatrix for connecting via SIP or MGCP to your IP PBX system.

ATA adapters from ZOOM for connecting via SIP to your IP PBX system.