- From: (unknown charset) Graham Klyne <GK@dial.pipex.com>
- Date: Mon, 18 Sep 2000 09:24:19 +0100
- To: (unknown charset) Dave Crocker <dhc2@dcrocker.net>
- Cc: (unknown charset) vint cerf <vcerf@MCI.NET>, Patrik (unknown charset) Fältström <paf@cisco.com>, "James P. Salsman" <bovik@best.com>, Jim.Mathis@Motorola.com, ned.freed@innosoft.com, discuss@apps.ietf.org, ietf-mmms@imc.org, ietf@ietf.org, Johan Hjelm <johan.hjelm@era-t.ericsson.se>
At 09:23 AM 9/16/00 -0700, Dave Crocker wrote: >At 08:12 AM 9/16/00 -0400, vint cerf wrote: >>would it be useful, in the context of establishing peer-to-peer >>communications >>(or even client/server communications) with limited-function mobile devices, >>to use SIP as a framework for negotiating the parameters that should >>guide the >>nature of the exchange? I'm thinking, for instance, of a web server that may >>usefully discover the functional limits of a mobile before it starts to send >>content to that device. The mobile uses SIP to report to the server that it >>has X amount of memory, Y amount of display area, color or not, average >>data rate it can send or receive, and so on. This information would be used >>by the server to configure what it sends to be compatible with the receiving >>unit. >> >>perhaps this is an idea that is already being pursued in an IETF working >>group? > > >The Content Negotiation work would cover this sort of exchange, I believe. See RFC 2506, RFC 2533, RFC 2534. But also note... There is work in W3C (CC/PP working group) that addresses exactly this area, from a perspective of data format. Some initial public drafts are available for comment at http://www.w3.org/Mobile/CCPP/. There was also a BOF held in Pittsburgh to garner interest in HTTP extensions to convey capability information described using CC/PP, and maybe other formats. Both the CONNEG and CC/PP work have (rightly in my view) focused purely on formats for expression of capabilities. Details of protocols for conveying such information may reasonably vary between applications (HTTP, SIP, e-mail, etc.). #g ------------ Graham Klyne (GK@ACM.ORG)
Received on Monday, 18 September 2000 04:41:40 UTC