Hi, 

>Should the 199 response contain a Contact header? And if yes, in case a proxy 
>sends it, should it contain the address of 
>that proxy (since the UAS already sent a final response)?

IF the 199 is sent reliably be the proxy must contain a Contact header 
containing the address of the proxy, yes.

>Should we say that a proxy may only generate and send a 199 when it receives a 
>final error response on an INVITE client 
>Transaction which was in the PROCEEDING state? (i.e. 1xx response was received 
>before, so conceptually sending the 199 
>response is an action associated with the transition from PROCEEDING to 
>COMPLETED)

I am not sure I understand. The idea IS to send 199 when a final error response 
is received by the forking proxy, if a 18x has previously been received.

Regards,

Christer




Christer Holmberg wrote:
> Hi,
>
> I agree it may be a good idea to not forbid sending it reliably.
>
> I do think it would be good to have text, saying that it can be sent 
> unreliable even if reliable responses are required, though, so that proxies 
> aren't forced to terminate PRACKs etc.
>
> Regards,
>
> Christer
>  
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of 
> [EMAIL PROTECTED]
> Sent: 21. kesäkuuta 2008 1:38
> To: [email protected]
> Subject: Re: [Sip] Draft submission: draft-ietf-sip-199-00
>
>    From: "Christer Holmberg" <[EMAIL PROTECTED]>
>
>    [CHH] Whether the text should be in the document at all depends on if we
>    allow 199 to be sent reliably in the first place. Based on the comments
>    received so far we should not mandate 199 to be sent reliably, even if
>    100rel is required by the UAC. But, the question if whether we want to
>    FORBID sending it reliably.
>
> If we ever might allow 199 to be used for HERFP, we should admit the 
> possibility of sending it reliably in the first draft.  Otherwise, we'll be 
> locked out of sending it reliably in the future.
>
> Dale
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