src/net/java/sip/communicator/service/protocol/media/MediaHandler.java
/**
     * Adds a <tt>DTMFListener</tt> which will be notified when DTMF events
     * are received from the <tt>MediaHandler</tt>'s audio stream.
     * @param listener the listener to add.
     */
Adds a DTMFListener which will be notified when DTMF events
are received from the MediaHandler's audio stream.
@param listener the listener to add.
Adds a DTMFListener which will be notified when DTMF events are received from the MediaHandler ' s audio stream . @param listener the listener to add .
void addDtmfListener(DTMFListener listener)
    {
        if (listener != null)
            dtmfListeners.add(listener);
    }
void addDtmfListener ( DTMFListener listener ) { if ( listener != null ) dtmfListeners . add ( listener ) ; }
Adds a <tt>DTMFListener</tt> which will be notified when DTMF events
 are received from the <tt>MediaHandler</tt>'s audio stream.
Adds a <tt > DTMFListener< / tt > which will be notified when DTMF events are received from the <tt > MediaHandler< / tt > ' s audio stream .