private void startListener() {
try {
if (scn != null) scn.close();
// <i><b>listen to requests on port 5060</b></i>
scn = (SipConnectionNotifier) Connector.open("sip:5080");
scn.setListener(this);
} catch (IOException ex) {
// <i><b>handle IOException</b></i>
}
}
