nua_subnotref.c: using dialog usage refresher and shutdown functions.
Now actually retrying after retry-after (either in NOTIFY or in a XX response to SUBSCRIBE). Not waiting for final NOTIFY after we terminate subscription. Wait only when trying to fetch event state. darcs-hash:20060817183932-65a35-4a6b8eb17638881ac021eb66b0e4298ae7cdeb53.gz
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