Hi to all, this is my first post so excuse me if i was wrong to insert this post in this section e for any incomplete information about it;I hope you can help me 
I had to develop a voice chat application using a Server XMPP,in particular i use Ejabberd,and Smack API. I started setting the ejabberd.cfg file with 3478 in listening port(standard port for STUN protocol) and my virtual host; After that i begin testing the jingle demo app and, after some devices, i try to run it but with some problems;
when i run the application i get this two messages:
the first one:
de.javawi.jstun.attribute.UnknownMessageAttributeException: Unkown mandatory message attribute
at de.javawi.jstun.attribute.MessageAttribute.parseCommonHeader(MessageAttribute.j ava:105)
at de.javawi.jstun.header.MessageHeader.parseAttributes(MessageHeader.java:155)
at de.javawi.jstun.test.DiscoveryTest.test1(DiscoveryTest.java:105)
at de.javawi.jstun.test.DiscoveryTest.test(DiscoveryTest.java:65)
at de.javawi.jstun.test.demo.ice.ICENegociator.testInterface(ICENegociator.java:12 6)
at de.javawi.jstun.test.demo.ice.ICENegociator.access$000(ICENegociator.java:40)
at de.javawi.jstun.test.demo.ice.ICENegociator$1.run(ICENegociator.java:88)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:679)
JavaSound Capture Supported = true
JavaSoundAuto: Committed ok
The second one:
No response from the server.:
at org.jivesoftware.smackx.ServiceDiscoveryManager.discoverInfo(ServiceDiscoveryMa nager.java:445)
at org.jivesoftware.smackx.ServiceDiscoveryManager.discoverInfo(ServiceDiscoveryMa nager.java:414)
at org.jivesoftware.smackx.jingle.nat.RTPBridge.serviceAvailable(RTPBridge.java:44 4)
at org.jivesoftware.smackx.jingle.nat.ICEResolver.resolve(ICEResolver.java:166)
at org.jivesoftware.smackx.jingle.nat.ICETransportManager.createResolver(ICETransp ortManager.java:45)
at org.jivesoftware.smackx.jingle.nat.JingleTransportManager.getResolver(JingleTra nsportManager.java:58)
at org.jivesoftware.smackx.jingle.JingleSession.startOutgoing(JingleSession.java:1 194)
at Demo$2.actionPerformed(Demo.java:117)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2012)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2335)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:404)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.ja va:253)
at java.awt.Component.processMouseEvent(Component.java:6268)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6033)
at java.awt.Container.processEvent(Container.java:2045)
at java.awt.Component.dispatchEventImpl(Component.java:4629)
at java.awt.Container.dispatchEventImpl(Container.java:2103)
at java.awt.Component.dispatchEvent(Component.java:4455)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4633)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4297)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4227)
at java.awt.Container.dispatchEventImpl(Container.java:2089)
at java.awt.Window.dispatchEventImpl(Window.java:2517)
at java.awt.Component.dispatchEvent(Component.java:4455)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:649)
at java.awt.EventQueue.access$000(EventQueue.java:96)
at java.awt.EventQueue$1.run(EventQueue.java:608)
at java.awt.EventQueue$1.run(EventQueue.java:606)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlConte xt.java:105)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlConte xt.java:116)
at java.awt.EventQueue$2.run(EventQueue.java:622)
at java.awt.EventQueue$2.run(EventQueue.java:620)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlConte xt.java:105)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:619)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:27 5)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:19 0)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)
Thanks to all.
Ilrosso