sip - SIPml5 单面语音

Question

下面是我的拨号器的代码。我可以使用以下代码成功注册和连接呼叫。但是，通话接通后，只有另一端（非 sipml5）才能听到声音。但是，sipml5 端听不到任何声音。但是，我可以使用 sipml5 网站（sipml5.org/call.htm）的 sipml5 客户端连接和传递语音。我一定做错了什么，但不知道是什么。

<script src="api/SIPml-api.js" type="text/javascript"> </script>
          <script type="text/javascript">
        var readyCallback = function(e){
                createSipStack(); // see next section
            };
        var errorCallback = function(e){
                onsole.error('Failed to initialize the engine: ' + e.message);
            }
        SIPml.init(readyCallback, errorCallback);

        var sipStack;
        var callSession;

      function eventsListener(e){
          console.info('Change of status|Server response: '+e.type+':'+e.message+':'+e.
session+':'+e.description);       
           if(e.type == 'started'){
                    login();
                }
           else if(e.type == 'i_new_message'){ // incoming new SIP MESSAGE (SMS-like)
                acceptMessage(e);
            }
           else if(e.type == 'i_new_call'){ // incoming audio/video call
                if(confirm("Incomming Call Request! Do you accept?")){
                    acceptCall(e);   
                }else{
                    e.newSession.reject()
                }
            }
       else if(e.type == 'connected'){
           if(e.session == registerSession){
                setStatus(e.type,'Registered...');
           }else{
                setStatus(e.type,e.description);
           }
       }
       else if(e.type == 'i_ao_request' && e.description == 'Ringing' ){
                document.getElementById('call').value = 'End Call';
                setStatus(e.type,e.description);
            }
       else if(e.type == 'terminated' || e.type == 'terminating'){
           if(e.session == registerSession){
                setStatus('Unable to Register');
            }else{
                setStatus(e.type,e.description);
            } 
       }             
   }

   function createSipStack(){
            sipStack = new SIPml.Stack({
                    realm: 'foo.bar.com',
                    impi: 'usertest', 
                    impu: 'sip:usertest@foo.bar.com',
                    password: '1234',
                    display_name: 'alice',
                    websocket_proxy_url: 'ws://11.11.11.0:8080',
                    enable_rtcweb_breaker: false,
                    events_listener: { events: '*', listener: eventsListener },
                    sip_headers: [ // optional
                            { name: 'User-Agent', value: 'IM-client/OMA1.0 sipML5-v1.0.0.0' },
                            { name: 'Organization', value: 'SuperCops.us' }
                    ]
                }
            );
        }
   sipStack.start();


   function login(){
       registerSession = sipStack.newSession('register', {
                events_listener: { events: '*', listener: eventsListener } // optional: '*' means all events
       });
       registerSession.register();

   }
   function makeCall(){
       var number = document.getElementById('number').value;
       if(number == ''){
            alert('No number entered');
       }
       else if(document.getElementById('call').value == 'End Call'){
           callSession.hangup();
       }else{
           setStatus('Trying','Trying to call:'+numberFilter(number));
           callSession = sipStack.newSession('call-audio',{
               events_listener: { events: '*', listener: eventsListener }
           });
           callSession.call(numberFilter(number));
       }
   }

   function acceptCall(event){
        callSession = event.newSession;
        /*('accept',{
               events_listener: { events: '*', listener: eventsListener }
           });*/
        callSession.accept();
        eventsListener(callSession);
        setStatus('connected','In Call');
   }

   function setStatus(type,status){
       document.getElementById('status').innerHTML = status;
       if(type == 'terminated' || type == 'terminating'){
           document.getElementById('call').value = 'Call';
       }else if(status == 'Ringing' || status == 'Ringing' || status == 'In Call'  || type == 'Trying'){
           document.getElementById('call').value = 'End Call';
       }
   }     

   function numberFilter(number){
       return number;
   }