import javax.sip.*; import javax.sip.address.*; import javax.sip.header.*; import javax.sip.message.*; public class SipSessionExample implements SipListener { private SipFactory sipFactory; private SipStack sipStack; private SipProvider sipProvider; private SipURI sipUri; public static void main(String[] args) { SipSessionExample sessionExample = new SipSessionExample(); sessionExample.createSipSession(); } public void createSipSession() { try { sipFactory = SipFactory.getInstance(); sipFactory.setPathName("gov.nist"); sipStack = sipFactory.createSipStack(); ListeningPoint listeningPoint = sipStack.createListeningPoint("127.0.0.1", 5060, "udp"); sipProvider = sipStack.createSipProvider(listeningPoint); sipProvider.addSipListener(this); AddressFactory addressFactory = sipFactory.createAddressFactory(); MessageFactory messageFactory = sipFactory.createMessageFactory(); HeaderFactory headerFactory = sipFactory.createHeaderFactory(); sipUri = addressFactory.createSipURI("user", "example.com"); SipURI fromUri = addressFactory.createSipURI("user1", "example.com"); Address fromAddress = addressFactory.createAddress(fromUri); fromAddress.setDisplayName("User 1"); SipURI toUri = addressFactory.createSipURI("user2", "example.com"); Address toAddress = addressFactory.createAddress(toUri); toAddress.setDisplayName("User 2"); CallIdHeader callIdHeader = sipProvider.getNewCallId(); CSeqHeader cSeqHeader = headerFactory.createCSeqHeader(1L, Request.INVITE); MaxForwardsHeader maxForwardsHeader = headerFactory.createMaxForwardsHeader(70); Request request = messageFactory.createRequest(sipUri, Request.INVITE, callIdHeader, cSeqHeader, fromAddress, toAddress, null, maxForwardsHeader); sipProvider.sendRequest(request); System.out.println("SIP Invite sent!"); } catch (Exception ex) { ex.printStackTrace(); } } // Implement SipListener methods to handle SIP messages and events @Override public void processRequest(RequestEvent requestEvent) { // Handle incoming SIP requests } @Override public void processResponse(ResponseEvent responseEvent) { // Handle incoming SIP responses } @Override public void processTimeout(TimeoutEvent timeoutEvent) { // Handle timeout events } // Other SipListener methods // ... }