* Notifies any interested session attributes that this session is about
* to be passivated.
*/
public void notifySessionWillPassivate() {
Iterator attrValues = getSessionAttributeMap(false).values().iterator();
SipSessionEvent sipSessionEvent = new SipSessionEvent(this);
while (attrValues.hasNext()) {
Object attrValue = attrValues.next();
if (attrValue instanceof SipSessionActivationListener) {
((SipSessionActivationListener) attrValue).sessionWillPassivate(sipSessionEvent);