Connections is not always established

Question

I m trying on my site flash player comunication. Connection synhronization is on my site.
Connection between some IP s is established well and continue to the end of call. But between another IP s is not established at all.
What it may be ?
My site   TURDOS.RU (travel by byke or on foot) russian Moscow
May be for some GURU in ActionScript all the code
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
      xmlns:s="library://ns.adobe.com/flex/spark"
      xmlns:mx="library://ns.adobe.com/flex/mx"
      width="624" height="532" minWidth="500" minHeight="500"
      viewSourceURL="srcview/index.html"
      creationComplete="p2p_1()">
<fx:Declarations>
  <!-- Разместить невизуальные элементы (например, службы или объекты значений) -->
</fx:Declarations>
<fx:Script>
  <![CDATA[
   import mx.events.ListEvent;
   import mx.collections.ArrayCollection;
   private const CirrusAddress:String = "rtmfp://p2p.rtmfp.net";
   private const DeveloperKey:String = "a56230a18105f402da76990e-69964df27226";
   private var nc:NetConnection;
   private var myPeerID:String ;
   private var farPeerID:String = "";
   private var sendStream:NetStream;
   private var recvStream:NetStream;
   private var cam:Camera;
   private var mic:Microphone;
   private var loader:URLLoader;
   private var loader1:URLLoader;
   private var loader2:URLLoader;
   private var loader3:URLLoader;
   private var my_id:String;
   private var num:String;
   private var user1:String;
   private var adobeChatID:String;
   private var iam:String;
   private var adobeChatIDslave:String;
   private var tMaster:Timer;
   private var tSlave:Timer;
   private var tMaster1:Timer;
   private var tMasterLast:Timer;
   private var tRec:Timer;
   private var str10:String;
   private var request:URLRequest;
   private var request1:URLRequest;
   private var request2:URLRequest;
   private var request3:URLRequest;
   //private var path:String="http://localhost:1961/tur/";
   private var path:String="";
   private var timer_ind:int = 0;
   private var timer_ind1:int = 0;
   private var ok:int = 0;
   private var once:int = 0;
   private var once1:int = 0;
   private var camS:Camera;
   private var micS:Microphone;
   private var timerSeconds:int;
   private var timerSeconds1:int;
   private var file:FileReference; 
   private var fileSendStream:NetStream;
   // A Dataprovider for the listitem (to display downloads) 
            private var dp:ArrayCollection = new ArrayCollection;
   private var fileRecievedStream:NetStream;
   public  function p2p_1():void{
    cam = Camera.getCamera();
    if(cam) {
     cam.setMode(280,240,15,true);
     var vid:Video = new Video(cam.width, cam.height);
     vid.x = 0;
     vid.y = 0;
     vid.attachCamera(cam);
     video1.width = cam.width;
     video1.height = cam.height;
     video1.addChild(vid);
    else{
     //wcam.visible = true;
    mic = Microphone.getMicrophone();
    if(mic){
     //mic.setLoopBack(true);
     //mic.setUseEchoSuppression(true);
    else{
     //wmic.visible = true;
    if(cam!=null || mic!=null){
     Security.showSettings();
    error1.visible = false;
    nc = new NetConnection();
    nc.addEventListener(NetStatusEvent.NET_STATUS, ncHandler);
    nc.connect(CirrusAddress, DeveloperKey);
    //begin.enabled = false; 
    info1.visible = true;
    fileList.visible = false;
             fileList.addEventListener(ListEvent.ITEM_CLICK, itemDownloadHandler); 
    fl1.visible = false;
    fl2.visible = false;
    frec.visible = false;
    frec1.visible = false;
    close1.visible = false;
    load1.visible = false;
    fileSizeError.visible = false;
   private function ncHandler(event:NetStatusEvent):void {
    var myQueryStrings:Object=this.loaderInfo.parameters;
    my_id=myQueryStrings.id;
    num=myQueryStrings.num;
    user1=myQueryStrings.user1;
    iam=myQueryStrings.iam;
    info1.visible = false;
    if(event.info.code=='NetConnection.Connect.Closed')
     close1.visible = true;
    if(event.info.code!="NetConnection.Connect.Failed")
     if(iam=="slave"){
      if(once1 == 0){
       once1 = 1;//so that if some crazy thing think to call this stuff twice
       tSlave = new Timer(5000,0);
       myPeerID = nc.nearID;
       farPeerID = myQueryStrings.VideoChatID;
       labelBeginSlave.visible = true;      
       str10 = path + "VideoChatConnection.aspx?id="+my_id+"&num="+num+"&user1="+ user1  + "&iam=slave" + "&Init=no";
       request = new URLRequest(str10);
       loader = new URLLoader();
       try {loader.load(request); }
       catch (error:SecurityError) {trace("A SecurityError has occurred.");}
       loader.addEventListener(IOErrorEvent.IO_ERROR, errorHandler);
       loader.addEventListener(Event.COMPLETE, function (event:Event):void
        try {
         trace(loader.data);
         tSlave.addEventListener(TimerEvent.TIMER,function (event:Event):void
          tSlave.stop();
          str10 = path + "VideoChatConnection.aspx?id="+my_id+"&num="+num+"&user1="+ user1  + "&iam=slave" + "&Init=get";
          request = new URLRequest(str10);
          loader = new URLLoader();
          try {
           loader.load(request);
          catch (error:SecurityError)
           trace("A SecurityError has occurred.");
          loader.addEventListener(IOErrorEvent.IO_ERROR, errorHandler);
          loader.addEventListener(Event.COMPLETE, function (event:Event):void
           try {
            trace(loader.data);
            if(loader.data=="init"){
             timer_ind = 1; //that s the end of all timers
             //master indicated initialization
             tSlave.stop();
             labelBeginSlave.text = "  Ответ получен.";
             labelEndSlave.visible = true;
             initRecvStream();
             initSendStream();
             str10 = path + "VideoChatConnection.aspx?id="+my_id+"&num="+num+"&user1="+ user1  + "&iam=slave" + "&Init=putEnd";
             request1 = new URLRequest(str10);
             loader1 = new URLLoader();
             try {
              loader1.load(request1);
             catch (error:SecurityError)
              trace("A SecurityError has occurred.");
             loader1.addEventListener(IOErrorEvent.IO_ERROR, errorHandler);
             loader1.addEventListener(Event.COMPLETE, function (event:Event):void
              send.enabled = true;
              labelBeginSlave.visible = false;
              labelEndSlave.visible = false;
           catch (e:TypeError) {
            trace("Could not parse the XML file.");
          if(timer_ind!=1)
           tSlave.start();
         if(timer_ind!=1)
          tSlave.start();
        } catch (e:TypeError) {
         trace("Could not parse the XML file.");
      //master______________________________________________________________________
     else{
      if(once==0){
       //that will be called twice because of when stream come from slave and so var ONCE indicate that
       once = 1;
       tMaster = new Timer(5000,0);
       tMaster1 = new Timer(5000,0);
       tMasterLast = new Timer(200,0);
       timerSeconds = 0;
       timerSeconds1 = 0;
       myPeerID = nc.nearID;
       adobeChatID = nc.nearID;
       //call slave
       labelBeginMaster.visible = true;
       str10 = path + "VideoChatConnection.aspx?id="+my_id+"&num="+num+"&user1="+ user1 + "&adobeChatID=" + adobeChatID +
        "&masterInit=begin";
       request = new URLRequest(str10);
       loader = new URLLoader();
       try {loader.load(request);}
       catch (error:SecurityError) {trace("A SecurityError has occurred.");}
       loader.addEventListener(IOErrorEvent.IO_ERROR, errorHandler);
       labelSec.visible = true;
       labelSec.text = "время(сек):  " + timerSeconds.toString();
       loader.addEventListener(Event.COMPLETE, function(event:Event):void
            try {
         tMaster.addEventListener(TimerEvent.TIMER,function (event:Event):void
          timerSeconds += 5;
          labelSec.text = "время(сек):  " + timerSeconds.toString();
          tMaster.stop();
          str10 = path + "VideoChatConnection.aspx?id="+my_id+"&num="+num+"&user1="+ user1 + "&adobeChatID=" + adobeChatID +
          "&masterInit=get";
          request = new URLRequest(str10);
          loader = new URLLoader();
          try {
           loader.load(request);
          catch (error:SecurityError)
           trace("A SecurityError has occurred.");
          loader.addEventListener(IOErrorEvent.IO_ERROR, errorHandler);
          loader.addEventListener(Event.COMPLETE, function (event:Event):void
           try {
            if(loader.data=="Ok"){
             timer_ind = 1; //that s the end of all timers
             //slave indicated that it is ready so master has to init
             tMaster.stop();
             labelBeginMaster.text = "   Ответ получен.";
             labelInitSendMaster.visible = true;
             initSendStream();
             labelInitSendMaster.text = " Поток передачи иницилизирован.";
             str10 = path + "VideoChatConnection.aspx?id="+my_id+"&num="+num+"&user1="+ user1 + "&adobeChatID=" + adobeChatID +
             "&masterInit=init";
             request = new URLRequest(str10);
             loader = new URLLoader();
             try {
              loader.load(request);
             catch (error:SecurityError)
              trace("A SecurityError has occurred.");
             loader.addEventListener(IOErrorEvent.IO_ERROR, errorHandler);
             loader.addEventListener(Event.COMPLETE, function (event:Event):void
              trace(loader.data);
              labelInitRecvMaster.visible = true;
              //that s the end of game
              tMaster1.addEventListener(TimerEvent.TIMER,function (event:Event):void
               tMaster1.stop();
               timerSeconds += 5;
               labelSec.text = "время(сек):  " + timerSeconds.toString();
               str10 = path + "VideoChatConnection.aspx?id="+my_id+"&num="+num+"&user1="+ user1 + "&adobeChatID=" + adobeChatID +
               "&masterInit=getEnd";
               request2 = new URLRequest(str10);
               loader2 = new URLLoader();
               try {loader2.load(request2);}
               catch (error:SecurityError) {trace("A SecurityError has occurred.");}
               loader2.addEventListener(IOErrorEvent.IO_ERROR, errorHandler);
               loader2.addEventListener(Event.COMPLETE, function (event:Event):void
                if(loader2.data=="End"){
                 timer_ind1 = 1;
                 //may be error
                 //make here delay
                 tMasterLast.addEventListener(TimerEvent.TIMER,function (event:Event):void
                  timerSeconds1 += 200;
                  labelRecfarpeerID.text = timerSeconds1.toString() + " farPeerID равно " + farPeerID;
                    if(farPeerID!="")
                    tMasterLast.stop();
                    initRecvStream();
                    labelInitRecvMaster.text = " Поток приёма инициализирован.";
                    labelBeginMaster.visible = false;
                    labelInitSendMaster.visible = false;
                    labelInitRecvMaster.visible = false;
                    labelRecfarpeerID.visible = false;
                    labelSec.visible = false;
                    send.enabled = true;
                    tMaster1.stop();
                    str10 = path + "VideoChatConnection.aspx?id="+my_id+"&num="+num+"&user1="+ user1 + "&adobeChatID=" + adobeChatID +
                           "&masterInit=delFile";
                       request3 = new URLRequest(str10);
                    loader3 = new URLLoader();
                    try {loader3.load(request3);}
                    catch (error:SecurityError) {trace("A SecurityError has occurred.");}
                    loader3.addEventListener(IOErrorEvent.IO_ERROR, errorHandler);
                    loader3.addEventListener(Event.COMPLETE, function (event:Event):void
                 labelRecfarpeerID.visible = true;
                 labelRecfarpeerID.text = "farPeerID равно " + farPeerID;
                 tMaster.stop();
                 tMaster1.stop();
                 tMasterLast.start();
               if(timer_ind1==0)
                tMaster1.start();
              if(timer_ind1==0)
               tMaster1.start();         
           catch (e:TypeError) {
            trace("Could not parse the XML file.");
          if(timer_ind!=1)
           tMaster.start();
         if(timer_ind!=1)
          tMaster.start();
        } catch (e:TypeError) {
         trace("Could not parse the XML file.");
    else{error1.visible = true;
     //begin.enabled = true;
   private function initSendStream(): void{
    sendStream = new NetStream(nc, NetStream.DIRECT_CONNECTIONS);
    sendStream.bufferTime = 0;//minimum delay
    sendStream.addEventListener(NetStatusEvent.NET_STATUS, netStatusHandler);
    sendStream.publish("media");
    //send video and audio if any   
    camS = Camera.getCamera();
    if(camS) {
     camS.setMode(280,240,15,true);
     sendStream.attachCamera(camS);
    micS = Microphone.getMicrophone();
    if(micS){
     micS.setUseEchoSuppression(true);
     sendStream.attachAudio(micS);
    /*sendStream.attachAudio(Microphone.getMicrophone());
    cam = Camera.getCamera();
    cam.setMode(560,480,24,true);
    sendStream.attachCamera(cam);*/
    var sendStreamClient:Object = new Object();
    sendStreamClient.onPeerConnect = function(callerns:NetStream):Boolean {
     farPeerID = callerns.farID;
     trace("OnPeerConnect" + farPeerID);
     return true;
    sendStream.client = sendStreamClient;
    //init send stream for file exchange
    //so be that in any case that user will want to send file
    fileSendStream = new NetStream(nc, NetStream.DIRECT_CONNECTIONS); 
    fileSendStream.addEventListener(NetStatusEvent.NET_STATUS, netStreamHandler); 
    // Giving the stream a idName 
    fileSendStream.bufferTime = 0;//minimum delay
    fileSendStream.publish("file"); 
   private function initRecvStream(): void{
    tRec = new Timer(5000,0);//5 sec delay before to begin receive
    tRec.start();
    tRec.addEventListener(TimerEvent.TIMER,function (event:Event):void
     tRec.stop();
        recvStream = new NetStream(nc, farPeerID);
        recvStream.bufferTime = 0;//minimum delay
        recvStream.addEventListener(NetStatusEvent.NET_STATUS, netStatusHandler);
        recvStream.play("media");
        recvStream.client = this;
       //receive video and audio if any
       var vid:Video = new Video(280, 240);
       vid.x = 0;
       vid.y = 0;
       vid.attachNetStream(recvStream);
       video0.addChild(vid);
      //init receive stream for file exchange
      //so be that in any case that user will want to receive file
      // This functions handles the incomming data 
                  fileRecievedStream = new  NetStream(nc,farPeerID); 
                  fileRecievedStream.client = this; 
                  fileRecievedStream.addEventListener(NetStatusEvent.NET_STATUS, incomingStreamHandler); 
               // Using the "file" stream identification 
         fileRecievedStream.bufferTime = 0;//minimum delay
      fileRecievedStream.play("file"); 
   public function incomingStreamHandler(e:NetStatusEvent):void
                 // If there was a connection between you and the  target 
               if(e.info.code == "NetStream.Play.Start") 
                  // set the textBackgroundcolor to green 
                  // connectLabel.text = "Your Are connected"; 
                   // show the fileBrowse/Send view 
                    //fileField.visible = true; 
   private function sendSomeData(): void{
    var date:Date = new Date();
    var x:String = "\r\n_____ " + date.getHours().toString() + ":" + date.getMinutes().toString() + " _____";
    txtRecvdData.text += x + "\r\n" + txtSendData.text + "\r\n" + "______________________________";
    sendStream.send("receiveSomeData", txtSendData.text);
    txtSendData.text = "";
    txtRecvdData.scrollToRange(int.MAX_VALUE);
   public function receiveSomeData(str:String): void{
    if(str=="***!!!***send")
     frec1.visible = true;//your peer sending you a file
    else if (str=="***!!!***re"){
     frec.visible = false;//file is received
    else
    txtRecvdData.scrollToRange(int.MAX_VALUE);
    var date:Date = new Date();
    var x:String = "\r\n_____ " + date.getHours().toString() + ":" + date.getMinutes().toString() + " _____";
    txtRecvdData.text += x + "\r\n" + str + "\r\n" + "______________________________";
    txtRecvdData.scrollToRange(int.MAX_VALUE);
    //beep when message is received
    var myRequest10:URLRequest;
    var mySound10:Sound;
    myRequest10 = new URLRequest("click.mp3");
    mySound10 = new Sound();
    mySound10.load(myRequest10);
    mySound10.play();
   private function netStatusHandler(event:NetStatusEvent):void {
    trace(event.info.code);
   private function errorHandler(e:IOErrorEvent):void {
    trace("Had problem loading the  File.");
   private function browseHandler():void
                    fileSizeError.visible = false;
                  // Creating a new FileReference to start choosing 
                     file = new FileReference; 
                     // Adding eventListeners 
                     file.addEventListener(Event.SELECT, selectHandler); 
                     file.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler); 
                          file.addEventListener(ProgressEvent.PROGRESS, progressHandler); 
                          file.addEventListener(Event.COMPLETE, completeHandler); 
                    // Open the browse-file dialogue 
                           file.browse(); 
   private function selectHandler(event:Event):void
                         // If you selected a file to send 
                                file =  FileReference(event.target); 
                         // load the file 
                                file.load(); 
                        // Set the source textfield to the filename 
        load1.visible = true;
   private function completeHandler(event:Event):void
             //file lenght must be less than 14 000 000 byte
             if(file.data.length < 14000000)
             // The file was loaded succesfully 
                         //trace("completeHandler: " + event); 
                         // The send button will be enabled
       fileName.text = file.name;
                         btnSend.enabled= true;
       load1.visible = false;
       else{
        fileSizeError.visible = true;
   private function ioErrorHandler(event:IOErrorEvent):void
                          //trace("ioErrorHandler: " + event); 
   private function progressHandler(event:ProgressEvent):void
                // Process  loading the file 
                 var file:FileReference =  FileReference(event.target); 
                 //trace("progressHandler: name=" + file.name + "129 bytesLoaded=" + event.bytesLoaded + " bytesTotal=" + event.bytesTotal); 
                 //connectLabel.text = "progressHandler: name=" + file.name + " bytesLoaded=" + event.bytesLoaded + " bytesTotal=" + event.bytesTotal; 
                 load1.text = "Загрузка :  " + event.bytesTotal + " байт";  
   public function onFileSend(e:Event):void
                 // Creating an object 
                var fileData:Object = new Object(); 
                // Giving the object a property that container the  file data as a ByteArray 
               fileData.file = file.data 
                 // Property of the name of the file 
               fileData.name = file.name; 
                 // Sending the file to the target and it will be   received 
                 // by the 'onFileReceived' function 
       fileSendStream.send("onFileReceived",fileData);
      //fileSendStream.send("onFileReceived",file.data); 
     btnSend.enabled= false;
     sendStream.send("receiveSomeData", "***!!!***send");//indicate sending file
     frec.visible = true;
   public function netStreamHandler(e:NetStatusEvent):void
                trace(e.info.code);
   public function onFileReceived(info:Object):void
   //public function onFileReceived(ar:ByteArray):void
    frec1.visible = false;//your peer completes sending you a file
               // This functions handles the incomming data 
                 // We add the object to a dataprovider 
                // For displayin the files in a list 
                // Giving the name and file data as properties 
     dp.addItem({label:info.name, file:info.file}); 
               // If an item of the list was clicked 
                // Setting the dataprovider of the listcomponent 
     fileList.dataProvider = dp;
     fileList.visible = true;
     fl1.visible = true;
     fl2.visible = true;
             private function itemDownloadHandler(event:ListEvent):void
                // creating new FileReference 
                file= new FileReference(); 
                // saving the clicked item to your computer 
                // brings out a savedialogue 
                file.save(event.itemRenderer.data.file, event.itemRenderer.data.label);
    dp.removeAll();
    fileList.visible = false;
    fl1.visible = false;
    fl2.visible = false;
    file.addEventListener(Event.COMPLETE, completeHandler1); 
    file.addEventListener(Event.CANCEL, cancelHandler1);
    frec.visible = true;
   private function completeHandler1(event:Event):void
    // The file was loaded succesfully 
    //trace("completeHandler: " + event); 
    // The send button will be enabled
    sendStream.send("receiveSomeData", "***!!!***re");
    frec.visible = false;
   private function cancelHandler1(event:Event):void
    sendStream.send("receiveSomeData", "***!!!***re");
    frec.visible = false;
  ]]>
</fx:Script>
<mx:Application width="628" height="1500" horizontalAlign="left" layout="absolute"  >
  <s:Panel x="3" y="3" width="280" height="500" backgroundColor="#040000" chromeColor="#070000">
  </s:Panel>
  <s:VideoDisplay id="video1" x="3" y="253" width="280" height="240" chromeColor="#FFFFFF"/>
  <s:VideoDisplay id="video0" x="3" y="8" width="280" height="240" chromeColor="#FFFFFF"/>
  <s:TextArea x="293" y="424" width="323" height="48" id="txtSendData"/>
  <s:Button id="send" x="465" y="480" label="Отправить сообщение" click="sendSomeData()" enabled="false"/>
  <s:Label x="294" y="405" width="328" height="12" text="Если микрофон не работает,напишите текст.сообщение"/>
  <s:Label id="labelBeginMaster" visible="false" x="38" y="89" width="161" color="#F61010"
     fontSize="16" text="               Звоним ......."/>
  <s:Label id="labelInitSendMaster" visible="false" x="29" y="110" width="263" color="#F50E0E"
     fontSize="16" text="Иницилизация потока передачи...."/>
  <s:Label id="labelInitRecvMaster" visible="false" x="30" y="132" width="242" color="#F50E0E"
     fontSize="16" text="Иницилизация потока приёма...."/>
  <s:Label id="labelBeginSlave" visible="false" x="36" y="95" width="201" color="#F61010"
     fontSize="16" text="         Ожидание ответа ......."/>
  <s:Label id="labelEndSlave" visible="false" x="23" y="115" width="261" color="#F50E0E"
     fontSize="16" text="Иницилизация потока передачи...."/>
  <s:Label id="labelRecfarpeerID" visible="false" x="23" y="145" width="261" color="#F50E0E"
     fontSize="16" text="  Получение farePeerID...."/>
  <s:TextArea id="txtRecvdData" x="294" y="11" width="323" height="342" color="#8B8080"
     editable="false" verticalAlign="middle"/>
  <s:Label id="frec" x="335" y="163" width="253" height="44" color="#F00E0E" fontSize="24"
     fontStyle="italic" fontWeight="normal" text="Передача файла....."/>
  <s:Label id="frec1" x="335" y="188" width="306" height="44" color="#F00E0E" fontSize="24"
     fontStyle="italic" fontWeight="normal" text="Вам передают файл....."/>
  <s:Label id="close1" x="110" y="180" width="443" height="44" color="#F00E0E" fontSize="29"
     fontStyle="italic" fontWeight="bold" text="СОЕДИНЕНИЕ РАЗОРВАНО !"/>
  <s:Label  id="error1" visible="false" x="53" y="160" width="522" height="28" color="#F80B0B" fontSize="20" text="Нет связи с интернетом или Adobe сервер не отвечает"/>
  <s:Label  id="info1" visible="false" x="80" y="116" width="126" height="28" color="#F80B0B" fontSize="20" text="Ожидание...."/>
  <s:Label visible="false" id="qqq" x="75" y="176" width="140" height="24" text="Метка"/>
  <s:Label id="wcam" visible="false" x="69" y="335" width="180" height="29" color="#F50C0C" fontSize="21" text="веб камеры нет"/>
  <s:Label id="wmic" visible="false" x="71" y="369" width="180" height="29" color="#F50C0C" fontSize="21" text="микрофона нет"/>
  <s:Label id="labelSec" visible="false" x="94" y="65" width="100" height="21" color="#EB0D0D" fontSize="12"/>
  <s:TextInput id="fileName" x="294" y="375"/>
  <s:Button x="430" y="376" width="95" label="Обзор" click="browseHandler()"/>
  <s:Button id="btnSend" x="533" y="376" width="83" label="Загрузить" enabled="false" click="onFileSend(event)"/>
  <s:Label x="296" y="359" width="170" text="Загрузка файла"/>
     <mx:List id="fileList" x="305" y="129" width="298" height="24"/>
  <s:Label id="fl1" visible="true" x="305" y="117" width="299" backgroundColor="#F1EAEA"
     text="Кликните по названию файла,чтобы его сохранить"/>
  <s:Label id="fl2" visible="true" x="308" y="103" width="296" backgroundColor="#F6EFEF"
     fontWeight="bold" text="Получен файл"/>
  <s:Label id="load1" y="218" right="30" width="289" height="30" color="#F80F0F" fontSize="14"
     horizontalCenter="139" text="Загрузка :  0 байт" textAlign="center"
     verticalAlign="middle"/>
  <s:Label id="fileSizeError" x="309" y="261" width="309" height="34" color="#F51F0E"
     text="Размер файла не может быть более чем 14 Мбайт!!!"/>
</mx:Application>
</s:Application>

Answer 1

some kinds of NATs and firewalls can interfere with P2P communication.  please see this posting for more information:
   http://forums.adobe.com/message/1064983#1064983
if VideoPhoneLabs (the Cirrus sample) works in situations where your code does not, it may be a coding error on your part. if VideoPhoneLabs also doesn't work in those situations, it's probably a NAT or firewall issue.