Re: [RFC 4235 & draft-kuthan-sip-derive] 481 "Call doesn't exist" for initial SUBSCRIBE ?

Hi,

The UA should respond with a 481.  In the case of an out of dialog  
request the *meaning* of the response in this context is easy to  
understand. A receiving UA realizes that it referred to some dialog  
that does not exist. There are far too few response codes for us to  
create a new one in this situation, and it is unlikely that an  
automaton will be able to recover from this error if it has a  
different code.

thanks,
-rohan

On Oct 25, 2008, at 10:26 AM, Iñaki Baz Castillo wrote:
> This SUBSCRIBE arrives to Alice's UA which is not aware of that  
> dialog. Which
> response should it reply? The flow suggests "481 Call/Transaction  
> doesn't
> exist", but... is it correct?
>
> AFAIK, a 481 should be replied when an *in-dialog* request arrives  
> to an UAS
> which is not aware of that dialog. But in the above case we have an  
> *initial*
> request and the 481 refers to the specific dialog in the "Event"  
> header.

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