[Asterisk-Users] ANALOG FXO ZAPTEL & WCFXO & WCTDM module issues seen with intermittent analog lines

[Andrei (MPI)]

Hi Samudra,

It is known behaviour for TDM400P card Rev E/F with FXO module. 
Apparently it is a driver issue, which is yet to be fixed (confirmed 
with Digium support).
I had this happening  in about 6-8 hours after normal work, all channels 
would become unusable. No re-wiring of physical lines was needed to 
replicate this situation in my case.

What I am doing to prevent it is described here:

My script to start asterisk is called from inittab, so if the Asterisk 
quits for any reason, it would be restarted promptly.

1) run_asterisk:

#!/bin/bash

/sbin/modprobe zaptel debug=1
/sbin/modprobe wctdm debug=1
/usr/sbin/asterisk -vvvf
/sbin/rmmod wctdm
/sbin/rmmod zaptel
sleep 1
 
2) /etc/inittab entry to run asterisk:

ax:2345:respawn:/usr/sbin/run_asterisk

If you want it to take effect right away (and if your asterisk is stopped):

kill -HUP 1

That will force init process to re-read inittab.

3) Now here is my command restarting Asterisk periodically that would 
remove/reload all the modules, add this line to your crontab:

07 7,11,15,18,22 * * * /usr/sbin/asterisk -rx "stop when convenient"

This way Asterisk will only restart when no calls are in progress. Your 
phone users should not even notice this.

Sincerely,
Andrei

Samudra E. Haque wrote:

>Hello, I have found a "bug", I think in the way TDM400P cards handle FXO
>interface disconnect/re-connect problems. Normally I do keep all the wires
>connected from my CO / PABX quite securely, but I had a need to re-route the
>cable from one side of the desk to another, and I simply disconnected the
>RJ-45 connector and plugged it back in. THIS PROMPTLY RESULTED IN VERY VERY
>SCRATCHY AUDIO CONNECTIONS WHEN USING THE FXO PORT. Incoming calls were
>erratic, outbound calls were almost unuseable, dialled digits were
>almost unrecognizable.
>
>Basically after some difficult troubleshooting the fix was:
>
>before disconnecting cable
>kill asterisk process
>remove WCTDM module
>remove WCFXO module
>remove ZAPTEL module
>and then, reconnect cable,
>and then, install ZAPTEL, WCTDM, WCFXO, start asterisk once again.
>
>Apparently during operation of the zaptel driver, disconnect of the cables
>to the ports is not recommended. I can replicate this condition easily, and
>if other users have any trouble with their analog ports due to the fact that
>their connections are flaky after some change (while asterisk is running) I
>would love to know how they coped with it.
>
>-samudra
>
>
>
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