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

[Gerald Short]

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
geralds at gctelecom.com
+1-415-299-9644 USA phone
+61-410-405-855 AUS phone
+1-415-532-3222 USA fax


-----Original Message-----
From: asterisk-dev-admin at lists.digium.com
[mailto:asterisk-dev-admin at lists.digium.com] On Behalf Of Kristopher
Lalletti
Sent: Friday, June 11, 2004 8:19 AM
To: asterisk-dev at lists.digium.com
Subject: RE: [Asterisk-Dev] Problems with ring debounce on TDM400P FXO
channel

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
Coalescent Systems Inc
403.244.8089
www.voxbox.ca

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