From: Jay Hennigan (jay@xxxxxxxx)
Date: Tue Oct 02 2001 - 17:56:25 GMT-3
On Tue, 2 Oct 2001, Juan Alcaide wrote:
> So if you have
>
>
> Tel1--ROUTER-FXO----FXS-PBX---(cloud)-Tel2
>
> With my config:
> Tel1 can dial Tel2 (FXO says to FXS I want to dial Tel2)
> Tel2 cannot dial Tel1 (FXS can not say to FXO I want to dial Tel1)
FXO is not intended to connect to a telephone, but to a telephone line.
If you connect a POTS dialtone to the FXO side instead of Tel1 you should
have a working setup. Conversely, move the PBX to the other side of your
diagram, as the FXS side is happy talking directly to a telephone.
Keep the following in mind and you should be OK:
An FXS port:
* connects to a telephone
* sources battery power to the telephone
* provides dialtone
* provides ringing voltage
* accepts dialed digits from the telephone
* "looks like" a central office line
An FXO port:
* connects to a telephone line
* sinks (consumes) battery power from the line
* "hears" dialtone
* accepts ringing voltage
* sends dialed digits out to the line
* "looks like" a telephone
Sending digits into an FXO interface from the outside would be like
someone calling you on the phone and playing touchtones into your ear,
it won't cause anything interesting to happen from a network standpoint
and it will annoy ther person called. Voice-mail and IVR are quasi-
ecxeptions in that tones played into such devices after a call is
answered can cause things to happen, but not in terms of the call
placed to the voice-mail or IVR system itself.
To configure a setup where the Cisco VoIP works as an "intercom" with
two telephones that can dial each other, you should use two FXS ports.
If what you have in your home lab is an FXS and FXO and you want to
practice, configure the FXO as a an outbound POTS call leg either to
a station port on a PBX or a plain old phone line.
-- Jay Hennigan - CCIE #7880 - Network Administration - jay@west.net NetLojix Communications, Inc. - http://www.netlojix.com/ WestNet: Connecting you to the planet. 805 884-6323 **Please read:http://www.groupstudy.com/list/posting.html
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