FXS gateway y FXO gateway en topologias de redes VoIP

Interfaces analogicas que pueden ser usadas en sistemas PBX con Asterisk

Your PSTN interface will consist of one or more analog circuits, each of which will require a Foreign eXchange Office (FXO) port.

Digium, the company that sponsors Asterisk development, produces analog interface
cards for Asterisk. Check out its web site for its extensive line of analog cards:
TDM400P,
TDM800P,
and the high-density TDM2400P.
For exmaple: the TDM800P is an eight-port base card that allows for the insertion of up
to two daughter cards, which each deliver either four FXO or four FXS ports.

The TDM800P can be purchased with these modules preinstalled, and a hardware echo-
canceller can be added as well. Check out Digium’s web site (http://www.digium.com)
for more information about these cards.

Other companies that produce Asterisk-compatible analog cards include:

• Rhino (http://www.channelbanks.com)
• Sangoma (http://www.sangoma.com)
• Voicetronix (http://www.voicetronix.com)
• Pika Technologies (http://www.pikatechnologies.com)