[Asterisk-Dev] Problems with ring debounce on TDM400P FXO channel

[Rich Adamson]

I've not seen the disconnect supervision impact this, however simply picking
up a bridged analog phone for a second or two is usually enough to cause
asterisk to ring the appropriate dialplan entry. The ring detection / processing
happens immediately after the analog phone hangup (not seconds later).
I'd have to guess and say this happens about one of three calls handled
by the bridged analog phone. Not very consistent. Applying the patch (changing
32 to 64 in wcfxs.c) seems to have a positive impact on it.

Rich
------------------------
> I an still observing and know nothing about the platform yet, but an
> analog trunk disconnect supervision signal (momentary reversal or open
> cct) from the telco delivered about 6 seconds after hangup may be
> interpreted as AC ring? As this event does not follow a hangup from
> asterisk it will not be expecting that disconnect supervision signal. As
> there are parallel device on the line how about the possibility of
> capacitor discharge high enough to trigger ring detection? What
> parameters does asterisk use to evaluate a ring is legitimate?  
> 
> Regards,
>   
> Gerald Short
> -----Original Message-----
> Has anyone decided to experiment on this problem by varying the line's
> signal impedance level?  
> 
> This sounds more like an impedance problem.
> 
> Kris
> 
> -----Original Message-----
> From: asterisk-dev-admin at lists.digium.com
> [mailto:asterisk-dev-admin at lists.digium.com] On Behalf Of Ryan Courtnage
> Sent: June 11, 2004 10:48 AM
> To: asterisk-dev at lists.digium.com
> Subject: Re: [Asterisk-Dev] Problems with ring debounce on TDM400P FXO
> channel
> 
> On 10-Jun-04, at 10:24 PM, Ron Frederick wrote:
> 
> > I also have some other devices directly connected to that same phone 
> > line,
> > in parallel with the TDM11B. I immediately noticed a problem in this
> > configuration when one of the other devices went back on-hook after 
> > using
> > the line. The wcfxs driver for the card recognized this as a "ring" 
> > event.
> 
> I have the exact same problem, both at home, and at my customer's site.
> 
> > I'm not sure if it would be safe to roll this change into the main 
> > tree, or
> > if the longer debounce time might cause problems in some other cases.
> 
> I would also like to hear some opinions on this.
> 
> Thanks,
> ..........................................
> Ryan Courtnage