derivedDataType PriorityPrefixDT

The value can be either an empty string or a string consisting of an asterisk followed by three decimal digits.

References from:
CscfServicePriorityClass;
stringPriorityPrefixDT [ 0..4 ]

Valid values: (^$|(\*[0-9]{3}))
  derivedDataType PriorityPrefixDT