[VoIP] Drop out on answer on Strowger switch.

[gijones@clear.net.nz]

Hi Ian

I don't know if you fixed this  problem.
I was wondering if line impedance could be a problem.
I found the link below about needing to make some changes to the Zaptel 
drivers to change line charcteristics.

http://www.voip-info.org/wiki/view/TDM400P

Apparently if you  use the Loadzone=UK option it doesn't actually change the 
line characteristics.
You have to get it changed and  set for the  wctdm module.

This may be totally off the mark.

Ian I'll email you off the lister later to let you know what I have been up 
to.

Later
Brent

----- Original Message ----- 
From: "Ian Jolly" <ian at uax.org.uk>
To: "CNET VoIP" <voip at ckts.info>
Sent: Friday, March 21, 2008 9:16 AM
Subject: [VoIP] Drop out on answer on Strowger switch.


> Hi All
>
> We have an Asterisk with a Zapmicro (version of the Digium TDM400) with 
> one FXS and an FXO connected to a former British Post Office UAX13 
> Strowger exchange.
>
> The FXO is connected direct to its own first group selector.
>
> On dialling a call into the Strowger switch, the call rings out but 90% of 
> the time, as soon as the call is answered the call drops out.  At the 
> point that the call is answered, the Strowger switch reverses the polarity 
> of the line to the FXO.
>
> On the other 10% of the calls, speech is possible for up to a minute after 
> answering then the call drops out without warning.
>
> We have the following in zapata.conf
>
> answeronpolarityswitch=yes
> cleardownonpolarityswitch=no
>
> but to no effect   :-((
>
> Anyone any ideas?
>
> Ian J
>
>
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