For troubleshooting a problem where all calls on a PRI are intermittently dropped at the same time, which alarm is best to monitor?

A.
BChannellSV

B.
DChannellSV

C.
BChannelOOS

D.
DChannelOOS

Explanation:
Error Message
%CCM_CALLMANAGER-CALLMANAGER-3-DChannelOOS: D channel out of service. Channel Id. [UInt], Unique channel Id [String], Device Name. [String], Device IP address [String], Reason [Optional]. [ Enum ]
Explanation Indicated D channel has gone out of service. Recommended Action Contact TAC for help if this alarm continue to generate. http://www.cisco.com/en/US/partner/products/sw/voicesw/ps556/prod_error_message09186a00802eb191.html