Help: FXO Card Red Alarm


I’m semi-new to Asterisk: I’ve got a generic clone FXO card installed that has worked in the past. I’m on Asterisk 1.2 now, and the card seems to be in red alarm all the time. I noted that it says “ok” for about 5 seconds after connecting the PSTN line…and then it goes red. If there’s any more info I can give, let me know…


The zttool utility will report “RED” for analog interfaces (like yours) that don’t have a phone line connected to them. The fact that yours shows “OK” for a few seconds then “RED” after suggests that your phone line may be having some trouble, or the cable you’re using. Check everything between the gray box outside and your FXO before you start checking software things.