First thing I'd do is to put a multimeter across the fxo tip-ring and
look for disconnect supervision. In the US, that's typically a momentary
open (no voltage) at the end of a call.
Some centrex equipment can be configured to provide it while others
don't have such a feature. If you find a difference, ask SBC to provide
on your lines.
------------------------
> Has anybody successfully setup an Adit 600, FXO via Kewlstart on a
> Centrex line?
>
> My setup:
>
> Test system:
>
> Asterisk (Current CVS - 12-08-2005)
> Adit 600 with 1 FXO 8 card
> 1 Loopstart (Centrex) phone line from SBC (Battle Creek, MI)
> Channel bank setup as lscpd on the FXO card.
> Asterisk signaling is FXS kewlstart
>
> Incoming and outgoing calls work fine.
>
> Semi-Production box
> (Communications between facilities full time, 2 outside lines).
>
> Asterisk (Current CVS - 12-08-2005)
> Adit 600 with 1 FXO 8 card
> 2 Loopstart (Centrex) phone line from SBC (Livonia, MI)
> Channel bank setup as lscpd on the FXO card.
> Asterisk signaling is FXS loopstart
>
> My scenario:
>
> My test system using either loopstart or kewlstart works just fine, but
> call disconnects take around 9 seconds before being detected.
>
> My semi-production box, running loopstart never detects disconnect and
> times out before hangup, switching to kewlstart, disconnects are
> immediate. But, I am unable to dial out.
>
> Any suggestions on how to diagnose this problem. I'm supposed to be
> onsite in Livonia Saturday to move the semi-production to a
> full-production box of 11 lines.
>
> Thanks,
>
> Doug Lytle