> Basically, you can't use the normal SIP authentication procedures
> with CANCEL, since -- as you point out -- if you're challenged,
> there's no room to manoeuvre. I would say the only possible
> responses to a CANCEL are 200, 481, 400 (because it was garbled),
> or 500 (because it got the server very upset for some bizarre
> reason).
But that would mean that a spurious CANCEL from a third party
would cancel a call between any 2 parties !! Since CANCEL has the power
to cancel a call, isn't authorization for CANCEL very important ?
The RFC does not mention anything about failure responses for CANCEL
....so shouldn't a 401 be allowed ?
Subhash
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