16 Aug
2007
16 Aug
'07
12:18 p.m.
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(a)freenet-ag.de>
An: cherami(a)gmx.de
CC: serusers(a)lists.iptel.org
Betreff: Re: [Serusers] presence server 2 presence server
cherami(a)gmx.de wrote:
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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