Subject: [RAI] FW: media-policy-dataset: "q" attribute

From: Andrew Allen <[email-masked]>
Date: Mon, 8 Aug 2011 23:48:14 +0000

-----Original Message-----
From: Andrew Allen 
Sent: Monday, August 08, 2011 6:44 PM
To: 'Worley, Dale R (Dale)'; [email-masked]'
Subject: RE: media-policy-dataset: "q" attribute

Dale,

I think we should do a sanity check that the media policy dataset still meets all the session policy use cases discussed in:

http://tools.ietf.org/id/draft-hilt-sipping-policy-usecases-00.txt

Although this draft was never progressed to an RFC it outlines the original use cases for session policy.

Also I think we should take a look at the whether the latest major MMUSIC extensions like ICE, SDP CAP NEG/Capability extensions (MCAP, TCAP, ACAP, CCAP etc), security negotiation and CS SDP are also covered by the media policy dataset. These are all things that I think the network policy may want to be able to influence the UA in its selection. In general what we come up with needs to be extensible to be able to apply policy to future as well as current SDP attributes.

Andrew

> -----Original Message-----
> From: [email-masked] [mailto:[email-masked]] On Behalf Of
> Worley, Dale R (Dale)
> Sent: Monday, August 08, 2011 2:08 PM
> To: [email-masked]
> Subject: [RAI] media-policy-dataset: "q" attribute
> 
> In several situations, draft-ietf-sipping-media-policy-dataset allows a
> session policy or session description to apply "q" values to elements of a
> list, showing which elements are preferred.  However, the SDP generated
> from a session description allows only very limited specification of
> preferences, viz., the ordering of the codec numbers shows their
> preference order.  In this context, the value of a full-fledged "q"
> attribute is very limited.  Should we keep it or remove it from the
> design?
> 
> Dale
> _______________________________________________
> RAI mailing list
> [email-masked]
> https://www.ietf.org/mailman/listinfo/rai

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