Re: [Sip] Open Issue #7: CANCEL for non-INVITE

Christer Holmberg wrote:
> 
> Hi,
> 
> I agree on this thread. Also, I don't see the problem with this issue,
> EVEN if there would be non-INVITE requests in the future that can be
> cancelled. The UAC and UAS should know what can be cancelled, and what
> can't be, and if the UAC tries to CANCEL something else the UAS simply
> returns 400/405/whatever... We could even add some response code saying
> "The request can't be cancelled"...

I don't understand this paragraph. Unless I'm misunderstanding the whole
discussion, the proposal is that it will be illegal in the future to
send a CANCEL for any non-INVITE request and it will be illegal for any
SIP device to implement CANCEL for non-INVITE. (It's always been legal
for UAS to not implement CANCEL.)

> 
> In fact, I am pretty sure the world would have been a better place
> without the CANCEL in the first place...

Well, nobody has to support it.

> 
> NOTE: That was NOT a proposal to remove CANCEL from SIP, just my
> personal opinion :)
> 

-- 
Henning Schulzrinne   http://www.cs.columbia.edu/~hgs

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