ensures proper toTag is set form dialog. This is key to support forked responses

Author: jaimecasero

sip-servlets-impl/src/main/java/org/mobicents/servlet/sip/message/SipServletRequestImpl.java

@@ -346,9 +346,11 @@ public SipServletResponse createResponse(final int statusCode, final String reas
 					final Dialog dialog = transaction.getDialog();
 					if(session != null && dialog != null && dialog.getLocalTag() != null && dialog.getLocalTag().length() > 0
 							&& session.getKey().getToTag() != null && session.getKey().getToTag().length() >0) {
-						if(!dialog.getLocalTag().equals(session.getKey().getToTag())) {
+						if(session.getB2buaHelper() == null &&
+                                                        !dialog.getLocalTag().equals(session.getKey().getToTag())) {
 							// Issue 2354 : if the dialog to tag is different than the  session to tag use the session to tag
 							// so that we send the forked response out with the correct to tag
+                                                        //Added B2BUA condition becuase this actually makes the forking cases to fail
 							if(logger.isDebugEnabled()) {
 						    	logger.debug("setting session ToTag: " + session.getKey().getToTag());
 						    }