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

[Samudra E. Haque]

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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