Request request = requestEvent.getRequest();
SipProvider sipProvider = (SipProvider) requestEvent.getSource();
this.inviteServerTxProvider = sipProvider;
if (request.getMethod().equals(Request.INVITE)) {
ListeningPoint lp = sipProvider.getListeningPoint(transport);
String host = lp.getIPAddress();
int port = lp.getPort();
ServerTransaction st = null;
if (requestEvent.getServerTransaction() == null) {
st = sipProvider.getNewServerTransaction(request);