[Asterisk-Users] Centrex

[Rich Adamson]

> Em Seg 01 Nov 2004 19:18, Tim Sailer escreveu:
> > On Mon, Nov 01, 2004 at 07:13:07PM -0200, Marcelo Pacheco wrote:
> > > If you plug a plain analog phone to the line, then you need an FXO card
> > > in it's place.
> >
> > Yup. It works with a plain ol' phone, Fax, and modem, but you need to
> > dial 9 to get out. Just a generic install of Asterisk and having the
> > FXO card configured, asterisk never sees the line ring.
> >
> > > Centrex usually means that you have hired a virtual PBX system. That in
> > > itself doesn't mean FXS/FXO/T1/E1, a Centrex could be shipped to you in
> > > many diferent ways.
> >
> > sigh. I hate phone companies.
> 
> I have the same issue you have, except that the issue is with a real 
> (Brazilian) PBX. I have 2 american phones (I live in Brazil) that won't 
> detect a ring from that PBX, but if I put another phone in parallel, so I can 
> hear the ring, I can pick up that phone and answer, everything else works ok. 
> However both a TDM400P FXO module and an MD3200 FXO work ok with that PBX.

It use to be very common for US phone ringers to be tuned to some specific
frequency (eg, 20hz, 30hz,... 60hz) for use in party lines. Ringing voltage
going to party 1 might use 30hz while ringing voltage to party 2 might be
50 hz. Might you have a phone that has one of those ringers?