SipCall.waitForAnswer broken - always get time out

[szcom]

transaction's block (returned by getBlock()) is never notified upon receiving any responses
and thus this line in SipCall.java always hangs
EventObject response_event = parent.waitResponse(transaction, timeout);

problem seems to be in SipSession::processResponse() as it returns prematurely here:

    if (listener != null)
    {
        listener.processEvent(response);
        **return;** 
    }

    // if no listener, use the default blocking mechanism
    synchronized (sip_trans.getBlock())
    {
        sip_trans.getEvents().addLast(response);
        sip_trans.getBlock().notifyEvent();
    }

[deruelle]

Would you be willing to contribute, submit a fix and pull request ?