Answering a call

1. Get the ring notification.
   One way to do this is to set up a special class to receive the ring notification.
   
2. Call CreateAndAnswerCall to answer the call.
   To determine whether the call connects, call GetStatus on the call handle.
   

   class TRingHandler
   {
   public:
                   TRingHandler (const TTelephoneLineHandle*);
   virtual         ~TRingHandler ();
   virtual void    HandleRing(const TTelephoneRingNotification&);
   
   private:
   
   TTelephoneLineHandle*   fLineHandle;
   TTelephoneCallHandle*   fCallHandle;
   TMemberFunctionConnection   fConnection;
   };
   
   // Implement TRingHandler. 
   TRingHandler::TRingHandler(const TTelephoneLineHandle* lineHandle)
                      : fLineHandle(lineHandle)
   {
         fConnection.SetReceiver(this, (NotificationMemberFunction)
               &TRingHandler::HandleRing);
       fConnection.AdoptInterest(fLineHandle->CreateRingInterest());
       fConnection.Connect();
   }
   
   TRingHandler::~TRingHandler()
   {
   delete fCallHandle;
   delete fLineHandle;
   }
   TRingHandler::HandleRing(const TNotification& ringNotification)
   {
   // If the phone system supports calling party ID, before the
   // call is connected you can ask who is calling
       TStandardText callingParty;
       ((const TTelephoneRingNotification&) 
                   theNotification).GetIncomingNumber(callingParty);
   
       // Answer the call
       fCallHandle = fLineHandle->CreateAndAnswerCall();
   }