The aggregate port requests denied object is an aggregate
metric indicating the number of port license checkout
requests that were denied since the start of the system. The
only reason a port license checkout request would be denied
is if the number of port licenses checked out at the time of
the request is equal to the total number of port licenses
available. When a port license checkout is denied, the call
does not receive regular treatment (the caller may hear a
busy tone or an error message).