question: public void addTransaction ( SIPServerTransaction serverTransaction ) throws IOException { if ( logger . isLoggingEnabled ( LogWriter . TRACE_DEBUG ) ) logger . logDebug ( "added transaction " + serverTransaction ) ; serverTransaction . map ( ) ; addTransactionHash ( serverTransaction ) ; }
target:  Add a new server transaction to the set of existing transactions. Add it to the top of the list so an incoming ack has less work to do in order to find the transaction.