Zaptel YELLOW alarm

When doing zap show status we get:

Description                              Alarms     IRQ        bpviol     CRC4
Wildcard TE12xP Card 0                   YEL        53         0          0

Possible solutions

http://www.asteriskguru.com/tutorials/yellow_alarm.html

The problem got solved when the PRI line was put down and restarted by the service provider, at their end.