> It's a deregister request. So you need to remove 
> all the bindings for that AoR.

Because it is missing the Contact header, the expires 0 cannot cause a 
deregister.  Thus unless you find a reason to reject it, it is fetch instead of 
a deregister.

Aspects are discussed within RFC 3261 sections 10.2.2, 10.2.3, and 10.3.


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