[SIPForum-discussion] transaction...

[Andy Chen]

Hi all,

In fact the transaction is a thing between hops.
Via-branch is only a mark to tell which the transaction is.

Andy


2007/8/17, Robert Sparks <rjsparks at nostrum.com>:
>
> Please also be aware of  http://tools.ietf.org/html/draft-sparks
> -sip-invfix
>
>
> RjS
>
>  On Aug 17, 2007, at 3:29 AM, <alexzhang at gdnt.com.cn> wrote:
>
>  What you said is not the root cause. Please refer to the RFC3261 -17.
> Transactions:
>
>       The reason for this separation is rooted in the importance of
>       delivering all 200 (OK) responses to an INVITE to the UAC.  To
>       deliver them all to the UAC, the UAS alone takes responsibility
>       for retransmitting them (see Section 13.3.1.4), and the UAC alone
>       takes responsibility for acknowledging them with ACK (see Section
>       13.2.2.4).  Since this ACK is retransmitted only by the UAC, it is
>       effectively considered its own transaction.
>
> And in my opinion, when the transaction layer of the UAC/UAS will be
> destroyed as soon as the 200 OK(Invite) is received. At this time, the UAC
> and UAS already know the location of each other. It means that the stateless
> proxy between them is not used any more. The ACK, which is created in a new
> transaction, will be transmitted from UAC to UAS directly.
>
> *Thanks,***
> *Alex ***
> *6-554-8782***
>
>
>  ------------------------------
> *From:* discussion-bounces at sipforum.org [
> mailto:discussion-bounces at sipforum.org <discussion-bounces at sipforum.org>]
> *On Behalf Of *Donald Lee
> *Sent:* Friday, August 17, 2007 3:05 PM
> *To:* Devanand Kumar
> *Cc:* discussion at sipforum.org
> *Subject:* Re: [SIPForum-discussion] transaction...
>
>
>  because it has unique Via branch-ID, which identifying the transaction.
>
>
> On 8/17/07, Devanand Kumar <devanand at techmahindra.com> wrote:
> >
> >  **
> >
> > *Hi ALL,*
> >
> > **
> >
> > *Please tell me the reason that why The ACK for a 2xx response to an
> > INVITE request is a separate transaction. *
> >
> > **
> >
> > *Thanks and Regards,*
> >
> > *Devanand Kumar *
> >
> > **
> >
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> >
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>
>
> --
> BR
> Donald _______________________________________________
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