src/net/java/sip/communicator/service/protocol/media/AbstractOperationSetBasicTelephony.java
/**
     * Registers <tt>listener</tt> with this provider so that it
     * could be notified when incoming calls are received.
     *
     * @param listener the listener to register with this provider.
     */
Registers listener with this provider so that it
could be notified when incoming calls are received.

@param listener the listener to register with this provider.
Registers listener with this provider so that it could be notified when incoming calls are received . @param listener the listener to register with this provider .
public void addCallListener(CallListener listener)
    {
        synchronized(callListeners)
        {
            if (!callListeners.contains(listener))
                callListeners.add(listener);
        }
    }
public void addCallListener ( CallListener listener ) { synchronized ( callListeners ) { if ( ! callListeners . contains ( listener ) ) callListeners . add ( listener ) ; } }
Registers <tt>listener</tt> with this provider so that it
 could be notified when incoming calls are received.
Registers <tt > listener< / tt > with this provider so that it could be notified when incoming calls are received .