Added broadcast state 'EXPIRED'.

src/altk/comm/engine/Broadcast.java

@@ -177,6 +177,7 @@ public abstract class Broadcast
                 BroadcastState.PAUSED,     // User action
                 BroadcastState.PURGED,     // User action
                 BroadcastState.ABORTED,    // TTS error
+                BroadcastState.EXPIRED,
                 BroadcastState.COMPLETED   // When recipient list is empty
             ));
         
@@ -188,6 +189,7 @@ public abstract class Broadcast
                 BroadcastState.PAUSED,     // User action
                 BroadcastState.PURGED,     // User action
                 BroadcastState.ABORTED,    // Service provider irrecoverable error
+                BroadcastState.EXPIRED,
                 BroadcastState.COMPLETED   // Natural transition, if all ongoing calls complete and no more calls in Dispatcher queues.
             ));