Subject: RE: AW: [Simple] RE: Question regarding NOTIFY messages using UDP .

From: Jonathan Rosenberg <[email-masked]>
Date: Wed, 5 Dec 2001 11:00:19 -0500

> -----Original Message-----
> From: Henning G. Schulzrinne [mailto:[email-masked]]
> Sent: Tuesday, December 04, 2001 11:55 AM
> To: Jonathan Rosenberg
> Cc: simple
> Subject: Re: AW: [Simple] RE: Question regarding NOTIFY messages using
> UDP.
> 
> > > Also, how
> > > long is the URL valid? Forever? Until the subscription expires?
> > 
> > We would need to specify that. I would argue that the URL 
> fetches the
> > current presence doc until the subscription expires.
> > 
> 
> Plus caching behavior.
> 
> I suspect the biggest problem will be the "get back to 
> notifier" issue.
> Effectively, you now have to have a public-Internet web 
> server that the
> notifier can control. Since you need to not just create documents but
> also delete them after expiration, you need WebDAV or some proprietary
> cgi interface, or also implement ftp (and know the file 
> structure of the
> server). (Updating the authorization table on the public-Internet web
> server will be even messier, since there's no published protocol for
> doing that.)

Sure; this will require a system with some HTTP/SIP integration. That does
exist already in some products. The whole thing is optional, of course; you
still have to support the presence doc. But, if the server supports this
capability, and the client indicates that they do as well, it can be used.

-Jonathan R. 

---
Jonathan D. Rosenberg, Ph.D.                72 Eagle Rock Ave.
Chief Scientist                             First Floor
dynamicsoft                                 East Hanover, NJ 07936
[email-masked]                     FAX:   (973) 952-5050
http://www.jdrosen.net                      PHONE: (973) 952-5000
http://www.dynamicsoft.com
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