The Presence-Specific Static Dictionary for Signaling Compression (Sigcomp)
draft-garcia-simple-presence-dictionary-06

[Ballot discuss]
I don't understand why this is on the Standards track, or how interoperability is affected by one party using an application-specific dictionary. There's a good chance I don't understand this well enough, but I'd like to understand at least that.

[Ballot comment]
I'm honestly dubious of the entire fixed dictionary approach.  Now the
LZW patent is expired (as of 2004), there's an extremely lightweight
dynamic dictionary algorithm with almost no overhead available in
addition to other successful alternatives (zlib/gzip).  I expect most
mobile devices to have zlib code for HTTP (and likely TLS) in order to
save bandwidth anyway, why not allow them to reuse that code for SIP?
Does the extra complexity of a custom fixed-dictionary algorithm with
negotiated dictionaries provide sufficient real benefits over the
general purpose likely-already-present compression code?

[Ballot comment]
To the extent that I can evaluate this document it seems fine.
However that wasn't really enough that I felt comfortable balloting a no-obj.
sigcomp is one of those things I  have not spent the time to understand.