Re: [Sipping] FW: I-D ACTION:draft-sriram-sipping-poc-lip-01.txt

[Dean Willis <dean.willis at softarmor.com>]

On Aug 23, 2005, at 12:33 AM, Juha Heinanen wrote:
> why is Push to talk over Cellular protocol needed at all?  why should 
> it
> matter if push to talk sip UAs are connected to cellular network rather
> than anywhere on the internet?  ietf mailing list bandwidth should not
> be consumed for these kind of walled garden problems.

Two points in response to the bait:

RFC 2804 says:

   - On the other hand, the IETF believes that mechanisms designed to
     facilitate or enable wiretapping, or methods of using other
     facilities for such purposes, should be openly described, so as to
     ensure the maximum review of the mechanisms and ensure that they
     adhere as closely as possible to their design constraints. The IETF
     believes that the publication of such mechanisms, and the
     publication of known weaknesses in such mechanisms, is a Good
     Thing.

So, publication of this, even if meant for a walled garden, is a Good 
Thing according to 2804. So is publicly pointing out the design 
constraints therein, so feel free to offer technical criticism.

As for "Why PoC" -- Today's mobile phone networks have such 
minimal-bandwidth, high-latency connections that all sorts of tricky 
B2BUA stuff and in-network buffering is needed to get them to support 
most of the more complex scenarios. Hence, a need for a rather 
specialized specification. Trust me, you do NOT want these discussions 
happening at IETF -- it doesn't fit here any more than Vint's work on 
the Interplanetary Internet. Yes, mobile networks are potentially more 
alien than Martians . . .

But of all of the questionable manipulations of IETF protocols going on 
in various non-IETF organizations, this is actually one of the most 
defensible. I tried very hard and couldn't find a "good" way to meet 
the requirements without hacking things up, and failed. So for now I'll 
settle for "least offensive" and "doesn't preclude connecting to more 
normal stuff".

--
Dean (writing from an OMA PoC meeting in Montreal. Bonjour!)


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