if(System.getProperty("enableNIO") != null && System.getProperty("enableNIO").equalsIgnoreCase("true")) {
properties.setProperty("gov.nist.javax.sip.MESSAGE_PROCESSOR_FACTORY", NioMessageProcessorFactory.class.getName());
}
try {
// Create SipStack object
sipStack = sipFactory.createSipStack(properties);
System.out.println("createSipStack " + sipStack);
} catch (PeerUnavailableException e) {
// could not find
// gov.nist.jain.protocol.ip.sip.SipStackImpl
// in the classpath