Jonathan
Thanks for your response.
I am unable to understand what you mean by
The reason is that if this recursed request hits a proxy which has already
seen the request, it can
generate an error response (since its a merged request),
Since the recursed request will be addressed to a new Contact, where is the
error?
Venkat
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of Jonathan
Rosenberg
Sent: Tuesday, May 08, 2001 12:11 PM
To: 'Arunachalam Venkatraman'; [EMAIL PROTECTED]
Subject: RE: [Sip-implementors] Questions on Redirection
> -----Original Message-----
> From: Arunachalam Venkatraman [mailto:[EMAIL PROTECTED]]
> Sent: Monday, May 07, 2001 3:14 PM
> To: [EMAIL PROTECTED]
> Subject: [Sip-implementors] Questions on Redirection
>
>
> In Section 7.3.3 of bis02, 2 approaches are presented for
> redirection when a
> 302 Moved Temporarily response is received.
> The first approach, re-using the same Call-Id and Cseq is mandated for
> proxies but not for UACs.
> The second approach, for UACs only, allow the use of a new
> Call-Id. (In
> addition, UACs MAY replace the TO with the Contact in 302)
>
> Question 1: Why is this specified only for 302? Would not the
> same rules
> apply for 300, 301, 302, 305? ie. Proxies MUST use the same
> Call-id (and
> FROM, TO,CSEQ) and UACs MAY.
Yes, it should be for all redirects. I'll fix that.
>
> Question 2: Which approach is preferred by UAC implementers?
> What are the
> pros and cons of the 2 approaches for UACs?
I think usage of the same Call-ID is best. The reason is that if this
recursed request hits a proxy which has already seen the request, it can
generate an error response (since its a merged request), which speeds up
transaction processing. It also unifies treatment of the UA and proxy cases,
which is a good thing. In fact, I might be inclined to remove the text on
the new-call-id scenario entirely. You can always do that; nothing prevents
it. But, its easier if the spec specifies one way to do things rather than
many.
-Jonathan R.
---
Jonathan D. Rosenberg, Ph.D. 72 Eagle Rock Ave.
Chief Scientist First Floor
dynamicsoft East Hanover, NJ 07936
[EMAIL PROTECTED] FAX: (973) 952-5050
http://www.jdrosen.net PHONE: (973) 952-5000
http://www.dynamicsoft.com
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