Re: [Sipping] Load control event package

[Henning Schulzrinne <[e-mail]>]

We are trying to address both content and distribution; both need to  
be made more concrete as the draft matures.

It would certainly be helpful to learn from the PSTN experience  
related to load filters. References or brief descriptions would be  
appreciated.

I agree that cross-domain distribution may not work in all cases, but  
I would claim that it can work in many semi-friendly environments  
(e.g., enterprise connected to service provider). Also, unlike in the  
PSTN, we would want to involve various edge proxies and maybe even  
user agents, so a distribution mechanism is required.

Henning

On Jul 28, 2008, at 5:20 AM, Phelan, Tom wrote:

> Hi All,
>
> The points I was going to bring up when we cut off the queue were:
>
> Is the purpose of this package to describe the kinds of filters that  
> can
> be communicated or the mechanisms for communicating or both?
>
> Assuming that it's about the kinds of filters -- the PSTN uses a
> "standard" set of these sorts of things.  There are a handful or so of
> defined filters such as CANT (CANcel To), CANF (Cancel From), SKIP,  
> and
> a few others.  If we define filters I think they should not be  
> trivially
> different from these.  If something new or different is needed, so be
> it, but there needs to be good reasons for the differences.
>
> Assuming it's about distributing the filters -- I'll note that as  
> far as
> I know the PSTN doesn't define how to distribute the filters.  Mostly
> it's done through switch-by-switch manual configuration, I believe.  I
> think some automatic distribution might be desirable, but we should
> watch out for complexity-versus-benefit tradeoffs.  The point was  
> raised
> that, due to trust issues, it's unlikely that cross-domain  
> communication
> will be welcomed, and that will limit the usefulness of automatic
> distribution.
>
> Tom P.
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