[asterisk-users] pstn calls not picked up

[Balu Raman]

I have a PSTN line coming into FXO port 4 on a TDM400P. Incoming calls
are not being picked up. I don't find anything unusual in asterisk
log. I am clueless where I should look. I also find
zapata-additional.conf empty. The trouble started when the system was
accidentally shut down and rebooted.

Any help ? How do I diagnose if the TDM400P is not fried ?
Thanks,
-braman