[Asterisk-Users] FXO vs FXS question

[Benjamin on Asterisk Mailing Lists]

On Sat, 16 Oct 2004 19:05:34 +0200, Wolf Paul <wnp at doulos.at> wrote:

> What is the difference in functionality between an FXO and an FXS port?
> I know that the line from telco goes into an FXO and standard POTS phone
> goes into an FXS, but since both types of ports must be able to both
> make and answer calls, what is the actual functional difference?

An FXS port provides voltage to the phone, it also provides a
dialtone. An FXO port does none of that. Apart from that, the
signalling is different.

rgds
benjk

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