question: protected SipStackImpl ( ) { super ( ) ; NistSipMessageFactoryImpl msgFactory = new NistSipMessageFactoryImpl ( this ) ; super . setMessageFactory ( msgFactory ) ; this . eventScanner = new EventScanner ( this ) ; this . listeningPoints = new Hashtable < String , ListeningPointImpl > ( ) ; this . sipProviders = Collections . synchronizedList ( new LinkedList < SipProviderImpl > ( ) ) ; }
target:  Creates a new instance of SipStackImpl.