> > 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 ?
You can send a 401 if you like, but it's not all that helpful
(apart from stopping retransmissions).
- Jo.
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