[Serusers] presence server 2 presence server

[cherami at gmx.de]

Hi Olaf,

I understand that a client must/can subscribe to an other client to 
get notifications of his status.

But can a presence server do something like that?
Can a presence server subscribe to other clients?

The Idea is, that I have in my organisation Clients, that only needs 
the presence information of other clients in other organisations. So I 
want to cache/mirror in my server the presence information ot the 
clients ot the other organisation, so that I do need to connect the 
server ot the partners for each request from the clients of my 
organisation.

Best Regards
Koder

>             
> -------- Original-Nachricht --------
> Datum: Thu, 16 Aug 2007 09:53:04 +0200
> Von: Olaf Bergmann <Olaf.Bergmann at freenet-ag.de>
> An: cherami at gmx.de
> CC: serusers at lists.iptel.org
> Betreff: Re: [Serusers] presence server 2 presence server
> 
>             cherami at gmx.de wrote:
> >  Hi,
> > 
> > I am student and new to the Presence Model und Protocols.
> > 
> > I have in my student project the following scenario:
> 
> So, one task in this project would be to figure out the details by
> yourself, right? As a starting point, you should gather some
> material about distinct presence protocols and learn how these
> protocols work·
> 
> > company A wants to develop a presence service PA. The presence service
> > PA should get the data from the presence server PB of an other Company 
> B
> > over the Internet. The Presence information of PA should be made
> > available in the Company A for different applications.
> > 
> > my question:
> > can PA poll or subscribe all changed/updated Presence Information from
> > PB regularly. Or it should request the Presence Information of each
> > Presentity individually?
> 
> Most "real" presence protocols such as SIP-based presence (sometimes
> referred to as "SIMPLE") and XMPP at least allow for individual
> subscriptions as well as so-called subscriber lists.
> 
> One of the problems with this kind of application is the overhead
> >from presence messages, especially when using SIP. Therefore, XMPP
> might be a better choice for your specific application since it can
> provide for confederations of presence servers over a more efficient
> communication channel.
> 
> > which Presence server can implement the presence service PA.
> 
> SER could do this for SIP-based presence (including resource
> subscription lists), ejabberd could be used for XMPP.
> 
> > What should I do if PB uses another Protokoll?
> 
> You would have to use a protocol gateway. Look at the
> presence-related SER documentation to learn how this works.
> 
> HTH,
> Olaf
> 
        
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