Following on from my previous question, say I send A a REFER. A tells me the
subscription's duration. I'm too lazy to respond quick enough with a
resubscription, and A sends me a NOTIFY with "Subscription-State:
terminated;reason=timeout".
How can I resubscribe?
Remember that RFC 3515 says "follow the procedure in RFC 3265". RFC 3265
says in section 3.2.4 "Subscriber NOTIFY Behavior"
timeout: The subscription has been terminated because it was not
refreshed before it expired. Clients MAY re-subscribe
immediately. The "retry-after" parameter has no semantics for
"timeout".
Of course, if you try that with a REFER you end up creating a SUBSCRIBE with
"Event: refer" that does not match any existing subscription, and A rightly
rejects the SUBSCRIBE with a 403 Forbidden (as per RFC 3515 section 2.4.4).
Is it simply the case that you CAN'T resubscribe this implicit REFER? If I
sent another REFER, it's not quite the same as a normal SUBSCRIBE. (I'm not
asking for state change notifications, I'm asking A to do something.)
frank
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