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(_at_)ACM(_dot_)ORG)