VoIP: FSX, FXO, E&M

From: Anthony Pace (anthonypace@fastmail.fm)
Date: Sun Jun 08 2003 - 19:39:06 GMT-3

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Is my understanding of the VoiP cards correct:

FXS: Connect to an analog phone or a PBX in the same site

FXO: Connect to the PSTN via an analog trunk. The CO switch sends analog
calls accross this loop into the router-FXO which VoIPs them accross the
IP WAN or LAN.

E&M: COnncet to a PBX accross an analog trunk, perhaps to a site without
VoIP.

I have also heard that some PBX's use FXS to connect to the router. Is
there a good reference for this, or is it dependent on the PBX?

Tony Pace CCIE #10349

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