[Asterisk-Users] TDM400 FXO Screech

[Rich Adamson]

> A nasty screech.  That's what callers here sometimes when they dial into 
> my FXO port from the PSTN.  But usually, it works OK.
> 
> Is this common?

That was fairly common on the original TDM cards (rev E/F) with older
drivers. The problem would usually show up after the card has been
in operation for a week or so (time varied). Stopping asterisk and
restarting the driver usually corrected the problem.

If your card is an early revision, call digium support and explain
what's happening and they'll RMA the card.