[cisco-voip] Connecting FXO to FXS to simulate local loop problem.

[Nick Matthews]

Try 'no battery-reversal' on one or both of them.  Techincally I
believe the FXO side should have it, but it should work on either one
(if it's not sent, it won't be detected)  This is common with
cisco-to-cisco FXO-FXS.

-nick

On Sun, Apr 18, 2010 at 5:43 PM, jeremy co <jeremy.cool14 at gmail.com> wrote:
> Hi,
>
> I've got two routers that equipped with FXO and FXS ports connecting
> together.
> R1 (CME) FXO------------------------(FXS ) R2
>  Router with the FXO port is also the CME router.
>
> I try to make a call from ipphones connecting to R1 to R2.
>
> Pot Dial peer on R1 configured to direct call to FXO port, but I cannot see
> anything on debug voice dialpeer on R2 when making call from R1. I can see
> R1 FXO port goes off hook, but then disconnect after 2 sec.
>
> I guess that sth missed here, might be some loop start or ground signalling
> have to be configured on FXO port?
>
> Any one did this before?
>
>
>
> Jeremy
>
>
>
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