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
([EMAIL PROTECTED])