SipFactory sipFactory = SipFactory.getInstance(); Properties properties = new Properties(); properties.setProperty("javax.sip.STACK_NAME", "mySipStack"); properties.setProperty("javax.sip.IP_ADDRESS", "127.0.0.1"); properties.setProperty("javax.sip.OUTBOUND_PROXY", "proxy.example.com:5060/udp"); SipStack sipStack = sipFactory.createSipStack(properties); ListeningPoint listeningPoint = sipStack.createListeningPoint("127.0.0.1", 5060, "udp"); SipProvider sipProvider = sipStack.createSipProvider(listeningPoint); SipURI fromAddress = addressFactory.createSipURI("alice", "example.com"); Address fromNameAddress = addressFactory.createAddress(fromAddress); fromNameAddress.setDisplayName("Alice"); FromHeader fromHeader = headerFactory.createFromHeader(fromNameAddress, "12345"); SipURI toAddress = addressFactory.createSipURI("bob", "example.com"); Address toNameAddress = addressFactory.createAddress(toAddress); toNameAddress.setDisplayName("Bob"); ToHeader toHeader = headerFactory.createToHeader(toNameAddress, null); SipURI requestURI = addressFactory.createSipURI("bob", "example.com"); requestURI.setTransportParam("udp"); CSeqHeader cSeqHeader = headerFactory.createCSeqHeader(1L, Request.INVITE); CallIdHeader callIdHeader = sipProvider.getNewCallId(); Request inviteRequest = messageFactory.createRequest(requestURI, Request.INVITE, callIdHeader, cSeqHeader, fromHeader, toHeader, viaHeaders, maxForwards); SipListenerImpl sipListener = new SipListenerImpl(); sipProvider.addSipListener(sipListener); class SipListenerImpl implements SipListener { public void processRequest(RequestEvent requestEvent) { } public void processResponse(ResponseEvent responseEvent) { } }