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