Re: [MMUSIC] comedia-fix-00 comments

[Paul Kyzivat <pkyzivat@cisco.com>]

David,

Haven't seen you post for a long time. I thought maybe you had dropped 
off the face of the earth. I guess not. :-)

I've been discussing this with Jonathan and Ben. We will no doubt be 
back to you before long with specific responses. Meanwhile I want to 
clarify one thing:

David Yon wrote:
>
> During the extended period when comedia was 
> in development, I longed for just a "hook" that would allow for reliable 
> connection correlation.  But alas, since we are signaling media streams 
> that use an open-ended set of protocols, such a hook did not exist.  My 
> working assumption was that shoe-horning additional information into an 
> arbitrary protocol was outside the bounds of what SDP could impose.  
> Guess I was wrong. :-)
Back when I first got involved with comedia I shared the same desire for 
the "hook". Since I came in in the middle of the development, I took it 
as a requirement that "shoe-horning additional information into an 
arbitrary protocol was outside the bounds of what SDP could impose."

Accepting that limitation led to the existing comedia.

However, for the curent exercise, we started with the requirements for 
simple, with a protocol that is being designed concurrently. That gives 
us more flexibility. Then, starting with comedia, we tried to 
generalize, but relaxing the restrictions to fit the needs of simple. 
With relaxed restrictions that "hook" can be available, so other 
solutions are possible.

Of course, relaxing the restrictions potentially invalidates potential 
uses of comedia as it was. We have discussed various ways of dealing 
with this:
- make the "fixed" comedia be a new draft that coexists with the "old" 
comedia

- modify the "old" comedia draft so that it specifies two alternative 
ways of working - one compatible with the old restrictions, one with the 
new restrictions

- simply modify comedia to support the new assumptions, accepting the 
invalidation of some formerly valid cases

None of us knew whether there are any existing applications of comedia, 
so we couldn't assess the impact of invalidating them. We decided to 
simply float the proposal and see what kind of responses we got. Based 
on that we could decide which path to take.

You have provided us with at least one data point - that somebody cares 
about the "old" version. Do you know of current applications of it?

	Thanks,
	Paul

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