Zaptel YELLOW alarm
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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.