[Simple] Re: MSRP chat and IMDN

Hi Jussi:

Well, the case we are considering is not a full error, because some of 
the URIs are reachable, others aren't. I guess the mechanism could be 
extended to indicate "partial delivery", and include a list of URIs for 
which delivery failed. Certainly, we need a bit more of discussion on 
this, but first we (SIMPLE) need to take a determination of which path 
to follow (Eric's or Hisham's draft).

BR,

       Miguel

Jussi K. Virtanen wrote:
> Hi Miguel,
> 
> On 2006-03-20, Miguel Garcia <Miguel.An.Garcia@nokia.com> wrote:
>> I agree that at some point in time we need to synchronize
>> MSRP chat with IMDN, and it is not our intention to specify
>> a mechanism if we can reuse IMDN.
> 
>> BUT: draft-burger-simple-imdn-03 does not provide a mechanism
>> to inform whether a message has been delivered or not, instead,
>> the draft relies on the protocol (MSRP). Instead,
>> draft-khartabil-simple-im-receipts-00 provides a mechanism for
>> delivery receipt. So, depending on what the final IMDN mechanism
>> is able to provide, we will need or not to extend MSRP.
> 
> Couldn't the "first-recipient" mechanism of IMDN, described in
> Section 9.3.1 of draft-burger-simple-imdn-03, be extended from
> B2BUAs to MSRP switches as well? An excerpt from the section:
> 
>    o  If the B2BUA forwards the message, it SHOULD return an
>       "processed" IMDN, mindful of the privacy considerations
>       enumerated in Section 4.
>    o  If there was an error processing the message, the B2BUA
>       SHOULD return an "error" IMDN, mindful of the privacy
>       considerations enumerated in Section 4.
> 
> I believe an "error" IMDN could be a substitute for a 427
> response.
> 
> draft-khartabil-simple-im-receipts-00 explicitly prohibits
> requests of delivery receipts for messages that are transferred
> on top of MSRP (Section 7.1.1.). I see that as a problem because
> the delivery status in MSRP is bound to an MSRP session but
> one CPIM message can traverse on its way over multiple MSRP
> sessions, as it does in MSRP chat (draft-niemi-simple-chat-04).
> 
> 
> BR,
> 
> --
> Jussi K. Virtanen

-- 
Miguel A. Garcia           tel:+358-50-4804586
sip:miguel.an.garcia@openlaboratory.net
Nokia Research Center      Helsinki, Finland

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