RTP for Cisco IP Phones

Question

Hello friends!
I'm developing an application for Cisco IP Phones that whorks with JMF. Since there are some programmers in this forum that knows Cisco IP phones, I send my question here.
I was send succefully the XML message to phone (CiscoIPPhoneExecute), I was customized the paket's size to 160, etc. All works aparently. But audio stream does not reach to phone. Can anyone tell me why??
Below I write my source code.
Tanks!
Max.
import java.io.*;
import java.net.*;
import java.util.*;
import org.apache.xerces.impl.dv.util.Base64;
import javax.media.*;
import javax.media.control.*;
import javax.media.format.*;
import javax.media.protocol.*;
* @author  Administrator
public class MMHTTPPost {
    /** Creates a new instance of MMHTTPPost */
    public MMHTTPPost() {
        try {
             * Envia el CiscoIPPhoneExecute al telefono
            String xml = new String("<CiscoIPPhoneExecute>"+
                                        "<ExecuteItem Priority=\"0\" URL=\"RTPRx:Stop\"/>"+"<ExecuteItem Priority=\"1\" URL=\"RTPRx:10.1.15.10:23480\"/>"+
                                        "</CiscoIPPhoneExecute>");
            String  userId      = "Max",
                    password    = "12345",           
                    basicAuth   = "Basic ",           
                    params      = "XML=" + URLEncoder.encode(xml, "ISO-8859-1" );    
            byte[]  bytes       = params.getBytes();
            // Create a URL pointing to the servlet or CGI script and open an HttpURLConnection on that URL       
            URL url = new URL( "http://10.1.15.56/CGI/Execute" );       
            HttpURLConnection con = ( HttpURLConnection ) url.openConnection();       
            // Indicate that you will be doing input and output, that the method is POST, and that the content       
            // length is the length of the byte array       
            con.setDoOutput( true );       
            con.setDoInput( true );       
            con.setRequestMethod( "POST" );       
            con.setRequestProperty( "Content-length", String.valueOf( bytes.length ) );
            // Create the Basic Auth Header       
            Base64 encoder = new Base64();
            basicAuth = (String)encoder.encode( ((String)(userId + ":" + password)).getBytes() );
            System.out.println("Codificado: " + basicAuth);
            con.setRequestProperty( "Authorization", "Basic " + basicAuth.trim() );
            // Write the parameters to the URL output stream       
            OutputStream output = con.getOutputStream();       
            output.write( bytes );       
            output.flush();       
            // Read the response       
            BufferedReader input = new BufferedReader( new InputStreamReader( con.getInputStream() ) );       
            while ( true ) {           
                String line = input.readLine();           
                if ( line == null )                
                    break;           
                System.out.println( line );       
            input.close();       
            output.close();       
            con.disconnect();
             * Aca empieza la parte RTP/JMF
            // Create a Processor for the selected file. Exit if the       
            // Processor cannot be created.       
            Processor processor = null;       
            try {           
                String mediaUrl = "file:\\C:\\pruebas execute\\spacemusic.au";
                processor = Manager.createProcessor( new MediaLocator(mediaUrl));       
            } catch (IOException e){           
                System.out.println("Exception occured (1a): " + e);       
            } catch (NoProcessorException e){           
                System.out.println("Exception occured (1b): " + e);       
            // configure the processor       
            //processor.configure();       
            //Espera el estado Processor.Configured
            boolean result = waitForState(processor, Processor.Configured);
            if (result == false)
                System.out.println("No se pudo configurar el procesador...");
            // Block until the Processor has been configured       
            TrackControl track[] = processor.getTrackControls();       
            boolean encodingOk = false;       
            // Go through the tracks and try to program one of them to       
            // output ulaw data.       
            for (int i = 0; i < track.length; i++)        
                if (!encodingOk && track[i] instanceof FormatControl)            
                    if (((FormatControl)track).setFormat( new AudioFormat(AudioFormat.ULAW_RTP,8000,8,1)) == null)
track[i].setEnabled(false);
else
encodingOk = true;
else
// we could not set this track to ulaw, so disable it
track[i].setEnabled(false);
*Aqu? se cambia el tama?o del paquete a 160
if (((TrackControl)track[i]).isEnabled()) {
try {
System.out.println("Cambiando la lista de codecs...");
Codec codec[] = new Codec[3];
codec[0] = new com.ibm.media.codec.audio.rc.RCModule();
codec[1] = new com.ibm.media.codec.audio.ulaw.JavaEncoder();
//codec[2] = new com.ibm.media.codec.audio.ulaw.Packetizer();
codec[2] = new com.sun.media.codec.audio.ulaw.Packetizer();
((com.sun.media.codec.audio.ulaw.Packetizer)codec[2]).setPacketSize(160);
((TrackControl)track[i]).setCodecChain(codec);
catch (Exception e){
System.out.println("Error al cambiar el tamano del paquete: " + e);
System.out.println("Encoding ok?: " + encodingOk );
// At this point, we have determined where we can send out
// ulaw data or not.
// realize the processor
if (encodingOk)
//processor.realize();
// block until realized.
// get the output datasource of the processor and exit
// if we fail
//Espera el estado Processor.Realized
result = waitForState(processor, Processor.Realized);
if (result == false)
System.out.println("No se pudo realizar el procesador...");
DataSource ds = null;
try
ds = processor.getDataOutput();
catch (NotRealizedError e)
System.out.println("Exception occured(2): "+e);
// hand this datasource to manager for creating an RTP
// datasink.
// our RTP datasink will multicast the audio
try
String mediaUrl= "rtp://10.1.15.56:23480/audio/1";
MediaLocator m = new MediaLocator(mediaUrl);
DataSink d = Manager.createDataSink(ds, m);
d.open();
d.start();
catch (Exception e)
System.out.println("Exception occured(3): "+e);
catch ( MalformedURLException murlex )
System.out.println( murlex );
catch ( IOException ioex )
System.out.println( ioex );
* @param args the command line arguments
public static void main(String[] args) {
new MMHTTPPost();
* Convenience methods to handle processor's state changes.
private Integer stateLock = new Integer(0);
private boolean failed = false;
Integer getStateLock() {
     return stateLock;
void setFailed() {
     failed = true;
private synchronized boolean waitForState(Processor p, int state) {
     p.addControllerListener(new StateListener());
     failed = false;
     // Call the required method on the processor
     if (state == Processor.Configured) {
     p.configure();
     } else if (state == Processor.Realized) {
     p.realize();
     // Wait until we get an event that confirms the
     // success of the method, or a failure event.
     // See StateListener inner class
     while (p.getState() < state && !failed) {
     synchronized (getStateLock()) {
          try {
          getStateLock().wait();
          } catch (InterruptedException ie) {
          return false;
     if (failed)
     return false;
     else
     return true;
* Inner Classes
class StateListener implements ControllerListener {
     public void controllerUpdate(ControllerEvent ce) {
     // If there was an error during configure or
     // realize, the processor will be closed
     if (ce instanceof ControllerClosedEvent)
          setFailed();
     // All controller events, send a notification
     // to the waiting thread in waitForState method.
     if (ce instanceof ControllerEvent) {
          synchronized (getStateLock()) {
          getStateLock().notifyAll();

Answer 1

ignore my last post.. I didn't properly read the source code.
Anyway, I got g.711 streaming to work. I started out using the AVTransmit2 sample, but set the audio output format to what is used in the source code posted here. I've also applied the same codec chain described above, and that was it.
I could never get streaming to work using the first RTP streaming method described in the JMF Programmers guide (and this is the method used in the source posted above), but using the RTPManager, things work just fine.