Java APIs

Hi,

I am planning to develop a voip application with JAIN SIP API. recently, i've downloaded it. and now i've got problem in running Example.class that I got from the documentation.


import jain.protocol.ip.sip.*;
import jain.protocol.ip.sip.address.*;
import jain.protocol.ip.sip.header.*;
import jain.protocol.ip.sip.message.*;
import java.util.*;


public class Example implements SipListener {
private SipFactory sipFactory = null;
private AddressFactory addressFactory = null;
private HeaderFactory headerFactory = null;
private MessageFactory messageFactory = null;
private SipStack sipStack = null;
private SipProvider sipProvider = null;
private Iterator listeningPoints = null;

// Main
public static void main(String[] args) {
Example example = new Example();
example.sendMessages();
}

public Example() {
setup();
}

private void setup() {

// Obtain an instance of the singleton SipFactory
sipFactory = SipFactory.getInstance();

// Set path name of SipFactory to reference implementation
// (not needed - default path name)
sipFactory.setPathName("com.dynamicsoft.ri");

try {

// Create SipStack object
sipStack = (SipStack)sipFactory.createSipStack();
} catch(SipPeerUnavailableException e) {
// could not find com.dynamicsoft.ri.jain.protocol.ip.sip.SipStackImpl
// in the classpath
System.err.println(e.getMessage());
System.exit(-1);
} catch(SipException e) {
// could not create SipStack for some other reason
System.err.println(e.getMessage());
System.exit(-1);
}

// Set name of SipStack
sipStack.setStackName("Reference Implementation SIP stack");

try {

// Get SipStack's ListeningPoints
listeningPoints = sipStack.getListeningPoints();


// Create SipProvider based on the first ListeningPoint
sipProvider = sipStack.createSipProvider((ListeningPoint)listeningPoints.next());
} catch(NullPointerException e) {
System.err.println("Stack has no ListeningPoints");
System.exit(-1);
} catch(ListeningPointUnavailableException e) {
System.err.println(e.getMessage());
System.exit(-1);
}


// Register this application as a SipListener of the SipProvider
try {
sipProvider.addSipListener(this);
} catch(TooManyListenersException e) {
// A limit has been reached on the number of Listeners allowed per provider
System.err.println(e.getMessage());
System.exit(-1);
} catch(SipListenerAlreadyRegisteredException e) {
// Already been added as SipListener
System.err.println(e.getMessage());
System.exit(-1);
}
}

// Process transaction timeout
public void processTimeOut(jain.protocol.ip.sip.SipEvent transactionTimeOutEvent) {
if(transactionTimeOutEvent.isServerTransaction()) {
System.out.println("Server transaction " + transactionTimeOutEvent.getTransactionId() + " timed out");
} else {
System.out.println("Client transaction " + transactionTimeOutEvent.getTransactionId() + " timed out");
}
}

// Process Request received
public void processRequest(jain.protocol.ip.sip.SipEvent requestReceivedEvent) {
Request request = (Request)requestReceivedEvent.getMessage();
long serverTransactionId = requestReceivedEvent.getTransactionId();
System.out.println("\n\nRequest received with server transaction id " + serverTransactionId + ":\n" + request);

try {
// If request is not an ACK then try to send an OK Response
if((!Request.ACK.equals(request.getMethod())) && (!Request.REGISTER.equals(request.getMethod()))) {

sipProvider.sendResponse(serverTransactionId, Response.OK, "SDP body of Response", "application", "sdp");
}
} catch(TransactionDoesNotExistException e) {
System.out.println(e.getMessage());
System.exit(-1);
} catch(SipParseException e) {
System.out.println(e.getMessage());
System.exit(-1);
} catch(SipException e) {
System.out.println(e.getMessage());
System.exit(-1);
}
}

// Process Response received
public void processResponse(jain.protocol.ip.sip.SipEvent responseReceivedEvent) {
Response response = (Response)responseReceivedEvent.getMessage();
long clientTransactionId = responseReceivedEvent.getTransactionId();
System.out.println("Response received with client transaction id " + clientTransactionId + ":\n" + response);

try {
// Get method of response
String method = response.getCSeqHeader().getMethod();

// Get status code of response
int statusCode = response.getStatusCode();
// If response is a 200 INVITE response, try to send an ACK
if((statusCode == Response.OK) && (method.equals(Request.INVITE))) {

sipProvider.sendAck(clientTransactionId);
}
} catch(SipException e) {
System.err.println(e.getMessage());
System.exit(-1);
}
}

public void sendMessages() {
try {

// Create AddressFactory
addressFactory = sipFactory.createAddressFactory();

// Create HeaderFactory
headerFactory = sipFactory.createHeaderFactory();

// Create MessageFactory
messageFactory = sipFactory.createMessageFactory();
} catch(SipPeerUnavailableException e) {
System.err.println(e.getMessage());
System.exit(-1);
}

SipURL fromAddress = null;
NameAddress fromNameAddress = null;
FromHeader fromHeader = null;
SipURL toAddress = null;
NameAddress toNameAddress = null;
ToHeader toHeader = null;
SipURL requestURI = null;
CallIdHeader callIdHeader = null;
CSeqHeader cSeqHeader = null;
ViaHeader viaHeader = null;
ArrayList viaHeaders = null;
ContentTypeHeader contentTypeHeader = null;
Request invite = null;
Request options = null;
Request register = null;

try {
// create From Header

fromAddress = addressFactory.createSipURL("caller", sipProvider.getListeningPoint().getHost());
fromAddress.setPort(sipProvider.getListeningPoint().getPort());
fromNameAddress = addressFactory.createNameAddress("Caller", fromAddress);

fromHeader = headerFactory.createFromHeader(fromNameAddress);

// create To Header
toAddress = addressFactory.createSipURL("callee", sipProvider.getListeningPoint().getHost());
toAddress.setPort(sipProvider.getListeningPoint().getPort());
toNameAddress = addressFactory.createNameAddress("Callee", toAddress);
toHeader = headerFactory.createToHeader(toNameAddress);

// create Request URI
requestURI = (SipURL)toAddress.clone();
requestURI.setTransport(sipProvider.getListeningPoint().getTransport());

// Create ViaHeaders
String transport = sipProvider.getListeningPoint().getTransport();
if(transport.equals(ListeningPoint.TRANSPORT_UDP)) {
transport = ViaHeader.UDP;
} else if(transport.equals(ListeningPoint.TRANSPORT_TCP)) {
transport = ViaHeader.TCP;
}
viaHeader = headerFactory.createViaHeader(sipProvider.getListeningPoint().getHost(), sipProvider.getListeningPoint().getPort(), transport);
viaHeaders = new ArrayList();
viaHeaders.add(viaHeader);

// Create ContentTypeHeader
contentTypeHeader = headerFactory.createContentTypeHeader("application", "sdp");

// Create and send INVITE Request
callIdHeader = sipProvider.getNewCallIdHeader();
cSeqHeader = headerFactory.createCSeqHeader(1, Request.INVITE);

invite = messageFactory.createRequest(requestURI, Request.INVITE, callIdHeader, cSeqHeader, fromHeader, toHeader, viaHeaders, "SDP body of INVITE Request", contentTypeHeader);

sipProvider.sendRequest(invite);

// Create and send OPTIONS Request
callIdHeader = sipProvider.getNewCallIdHeader();
cSeqHeader = headerFactory.createCSeqHeader(1, Request.OPTIONS);
options = messageFactory.createRequest(requestURI, Request.OPTIONS, callIdHeader, cSeqHeader, fromHeader, toHeader, viaHeaders, "SDP body of OPTIONS Request", contentTypeHeader);
sipProvider.sendRequest(options);

// Create and send REGISTER Request
callIdHeader = sipProvider.getNewCallIdHeader();
cSeqHeader = headerFactory.createCSeqHeader(1, Request.REGISTER);
register = messageFactory.createRequest(requestURI, Request.REGISTER, callIdHeader, cSeqHeader, fromHeader, toHeader, viaHeaders, "SDP body of OPTIONS Request", contentTypeHeader);
long clientTransactionId = sipProvider.sendRequest(register);

// send CANCEL Request
sipProvider.sendCancel(clientTransactionId);

// send BYE Request
sipProvider.sendBye(clientTransactionId, true);
} catch(SipParseException e) {
// Implementation was unable to parse a value
System.err.println(e.getMessage() + "[" + e.getUnparsable() + "]");
System.exit(-1);
} catch(SipException e) {
// Another exception occurred
System.err.println(e.getMessage());
System.exit(-1);
}
}
}

Exception Message displayed:
The Peer JAIN SIP Object: com.dynamicsoft.ri.jain.protocol.ip.sip.SipStackImpl could not be instantiated. Ensure the Path Name has been set.




my questions are:
1. what pathname do i need to set(windows xp) ?any solution to this problem?
2. how to run jain presence proxy?
what are the settings required to run jain presence proxy?
3. can i build my own proxy server using JAIN SIP?

I would be very grateful if anyone could help me