This object specifies the day of the month on which user
wishes to receive periodic Call Home alert messages for this
entry.
If the day specified is beyond the last day of a month, the
alert message will be generated on the last day of that month.
This object is only instantiated when the value of
corresponding instance of ccmPeriodicAlertGroupEnable
is 'true' and the value of corresponding instance of
ccmPeriodicAlertGroupInterval is 'monthly'.