Re: [siprec] Can an MS object span several CSs in a CSG?

Hi Charles,

One of the usecase in my mind is discussed in
http://www.ietf.org/mail-archive/web/siprec/current/msg01890.html. The
details are as follows:

B2BUA acts as SRC. A, B, C are participants within single B2BUA. A
creates single RS for a CSG.

1) A calls B through B2BUA. B2BUA creates RS towards SRS with CSG1, CS1,
MS1 (A's media stream), MS2 (B's media stream), Participant1 as A &
Participant2 as B.
2) B connects with C through B2BUA
3) B transfer the call of A & B to C using REFER, B2BUA converts REFER
to RE-INVITE towards A & C and A & C are connected. B2BUA updates RS
with CS2, Participant1 as A & participant2 as C, MS1(A's media stream),
MS2(C's media stream). There is no update on RS1, CSG1, MS1, MS2. MS2
will become MS2 with the new association and in terms of format, it will
associate with <send> tag

Thanks
Partha  

-----Original Message-----
From: Charles Eckel (eckelcu) 
Sent: Wednesday, May 25, 2011 1:39 AM
To: Ram Mohan R (rmohanr); Parthasarathi R (partr); 'Elwell, John';
'siprec@ietf.org'
Subject: RE: [siprec] Can an MS object span several CSs in a CSG?

Hi Ram,

I think that is many cases, they will be treated as separate MSs due to
the complexities you mention. However, I am trying to understand if
Partha feels allowing an SRC to treat them as a single MS is still
required. If not, then what is a use case? A concrete example would help
me, and potentially others, to better understand the motivation behind
Partha's requirement for modeling media from multiple CSs as a single
MS.

Cheers,
Charles

> -----Original Message-----
> From: Ram Mohan R (rmohanr)
> Sent: Tuesday, May 24, 2011 9:36 AM
> To: Charles Eckel (eckelcu); Parthasarathi R (partr); Elwell, John; 
> siprec@ietf.org
> Subject: RE: [siprec] Can an MS object span several CSs in a CSG?
> 
> Charles,
> 
> I did bring about this specific usecase of MMOH/MOH stream being 
> played to different participants earlier and suggested that they have 
> to treated as a same MS across multiple CSs (potentially recorded
using multiple RSs).
> Refer 
> http://www.ietf.org/mail-archive/web/siprec/current/msg01886.html
> 
> We had several discussions on it and it and several folks were in 
> favor of treating it as separate MS as there would be complexity in DB
design.
> 
> Regards,
> Ram
> 
> 
> > -----Original Message-----
> > From: siprec-bounces@ietf.org [mailto:siprec-bounces@ietf.org] On 
> > Behalf Of Charles Eckel (eckelcu)
> > Sent: Tuesday, May 24, 2011 9:11 PM
> > To: Parthasarathi R (partr); Elwell, John; siprec@ietf.org
> > Subject: Re: [siprec] Can an MS object span several CSs in a CSG?
> >
> > Hi Partha,
> >
> > Is an example of this the same music on hold audio stream existing 
> > as the same MS within multiple CSs? If so, then I understand your 
> > requirement to be that the SRC be able to indicate multiple 
> > instances of this audio stream within several CSs as being the same 
> > MS. Is that correct?
> >
> > Thanks,
> > Charles
> >
> > > -----Original Message-----
> > > From: siprec-bounces@ietf.org [mailto:siprec-bounces@ietf.org] On
> > Behalf Of Parthasarathi R (partr)
> > > Sent: Tuesday, May 24, 2011 4:26 AM
> > > To: Elwell, John; siprec@ietf.org
> > > Subject: Re: [siprec] Can an MS object span several CSs in a CSG?
> > >
> > > John,
> > >
> > > I agree that it is not mandatory to consider recorded stream of a 
> > > specific participant in several CS within the same CSG as one
> > recorded
> > > stream but SIPREC protocol design MUST NOT restrict a SRC in case 
> > > it wishes to design in such a way.
> > >
> > > Thanks
> > > Partha
> > >
> > > -----Original Message-----
> > > From: siprec-bounces@ietf.org [mailto:siprec-bounces@ietf.org] On
> > Behalf
> > > Of Elwell, John
> > > Sent: Tuesday, May 24, 2011 1:06 PM
> > > To: siprec@ietf.org
> > > Subject: [siprec] Can an MS object span several CSs in a CSG?
> > >
> > > We seem to have consensus that a Media Stream object represents a 
> > > recorded media stream, contributed to by one, several or all 
> > > Participants. However, Partha also wrote:
> > >
> > > "2) Each MS lifetime related to CSG because participant may move 
> > > from one CS to another CS within single CSG and also CSG will span

> > > across multiple RS."
> > >
> > > I am not sure we had resolved this during earlier discussions on 
> > > the scope of an MS object. Although the same Participant can 
> > > participate
> > in
> > > several CSs within the same CSG, I don't think the recorded media 
> > > streams need to be considered the same. Any other views?
> > >
> > > John (as individual)
> > > _______________________________________________
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> > > siprec@ietf.org
> > > https://www.ietf.org/mailman/listinfo/siprec
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