This optional parameter allows you to define a custom SQL query to deallocate all previously allocated addresses for a NAS. If the DeallocateByNASQuery is an empty string or not defined, no deallocation query is executed. This query is not defined by default currently. %0 is replaced by the SQL quoted NasId.

# Process Accounting-On and Accounting-Off
DeallocateByNASQuery update RADPOOL set STATE=0, TIME_STAMP=%t where NAS_ID=%0