This is just a simple reusable congestion control valve JSIP apps can use to stop traffic when the number of
server transactions reaches the limit specified in gov.nist.javax.sip.MAX_SERVER_TRANSACTIONS without breaking
The drop policy is specified in DROP_RESPONSE_STATUS where "0" means silent drop and any positive number will be
interpreted as the status code of the error response that will be generated.
To enable this in your application you must specify this property:
It is advised to extend this class to add your application-specific control conditions