From: Scott Morris (swm@emanon.com)
Date: Sun Jun 08 2003 - 21:10:43 GMT-3
An FXO port relies on some other device to supply dial tone and works
like a normal telephone does. This can be an analog line (not trunk)
from the CO, or an FXS (analog station) port on a PBX.
The FXS port will supply dialtone, assuming the other device is kinda
dumb. Connect a telephone to it, or likewise you can connect a phone
system/PBX to the other end with a universal trunk card (or something
expecting a generic, all-purpose analog line from the CO)
The E&M port is designed to connected phone systems together and will
allow some extra signalling options for extended features.
So you have multiple ways of connecting things together, but what
features you will have where depends on how they're connected.
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Anthony Pace
Sent: Sunday, June 08, 2003 6:39 PM
To: ccielab@groupstudy.com
Subject: VoIP: FSX, FXO, E&M
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
-- Anthony Pace anthonypace@fastmail.fm-- http://www.fastmail.fm - Send your email first class
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