public static SipRequest createMessage(SipDialogPath dialog,String contentType,String content) throws PayloadException {
  return createMessage(dialog,null,contentType,content.getBytes(UTF8));
}

public static SipRequest createMessage ( SipDialogPath dialog , String contentType , String content ) throws PayloadException { return createMessage ( dialog , null , contentType , content . getBytes ( UTF8 ) ) ; }
create a sip message request with a feature tag
