Re: [splices] draft-loreto-splices-disaggregated-media-00

I also think that once we're done with the session-is issue, things in 
SPLICES can proceed really smoothly. Let's keep in mind that this same 
discussion is taking place in DISPATCH, also. Interested people should 
have a look at the thread over there.

Simon (as an individual)

Il 29/11/2010 16:23, Salvatore Loreto ha scritto:
> Hi John,
>
> On 11/26/10 1:10 PM, Elwell, John wrote:
>> I still don't like the fact that there is impact on Bob's UA.
> supporting new features most likely implies an impact on the UA(s) 
> that wants support them.
> anyway the features are optional!
>> Even though that impact might only be session correlation, this could 
>> be quite complex.
> if we are able to standardize a good and hopefully general session-id 
> mechanism,
> then the impact coming from SPLICE is really minimal.
>
> /Sal
>
>> It sounds to me like Bob's UA, on deciding that two SIP dialogs 
>> relate to the same session, must somehow merge the two session 
>> descriptions (SDP). In the simple case, where one session is audio 
>> only and the other is video only, it might be relatively simple, 
>> e.g., an assumption that the two need to be lip-synched could be 
>> made. But we surely would need to deal with more complex cases, e.g., 
>> an additional video stream for presentations, floor control of the 
>> presentation stream or other streams, multiple audio and/or video 
>> channels for telepresence, grouped media spanning more than one 
>> contributing session description, etc.. Multimedia SIP UAs will have 
>> no incentive to implement extensions to cover session correlation and 
>> merging, so this will constrain interoperability.
>>
>> John
>
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> splices@ietf.org
> https://www.ietf.org/mailman/listinfo/splices
>

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                     Simon Pietro Romano
               Universita' di Napoli Federico II
                  Computer Science Department
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                 e-mail: spromano@unina.it
           http://www.comics.unina.it/simonpietro.romano

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