[Serusers] r-uri for ACK

[Jiri Kuthan]

It depends. ACK for negative replies must have identical URIs as INVITEs.
Otherwise, it is dicated by record-routing. Loose routers (i.e., those that
implement RFC3261 as opposed to the obsoleted RFC2543) put peer's contact
in there, which is ideal. Strict routers put record-routing information 
there. This alternative is valid in terms of an obsoleted spec.

-jiri

At 11:02 AM 10/14/2004, Richard wrote:

>Hi,
>
>I have a basic sip question. What’s the correct r-uri for ACK? I use stateful forwarding, so all SIP messages pass through ser. I have seen two types of UA. Some use the contact field of 200 OK response as the r-uri and other use the original r-uri for INVITE.
>
>Is it a SIP violation to use the original r-uri of INVITE? The problem here is that if there is a parallel forking for the INVITE, it might be sent to places other than the real callee.
>
>Any comment?
>
>Thanks,
>
>Richard
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--
Jiri Kuthan            http://iptel.org/~jiri/