[Sip] Compact forms questions

[Kosta Koeman <[e-mail]>]

I've noted the following list from http://www.iana.org/assignments/sip-parameters that summarizes the compact forms defined for SIP (note: I have removed all header names without a compact form).

Allow-Events         u       [RFCevents] <draft-ietf-sip-events-05.txt>
Call-ID              i       [RFC2543], draft-ietf-sip-rfc2543bis
Contact              m       [RFC2543], draft-ietf-sip-rfc2543bis
Content-Encoding     e       [RFC2543], draft-ietf-sip-rfc2543bis
Content-Length       l       [RFC2543], draft-ietf-sip-rfc2543bis
Content-Type         c       [RFC2543], draft-ietf-sip-rfc2543bis
Event                o       [RFCevent] <draft-ietf-sip-events-05.txt>
From                 f       [RFC2543], draft-ietf-sip-rfc2543bis
Subject              s       [RFC2543], draft-ietf-sip-rfc2543bis
Supported            k       draft-ietf-sip-rfc2543bis
To                   t       [RFC2543], draft-ietf-sip-rfc2543bis
Via                  v       [RFC2543], draft-ietf-sip-rfc2543bis

So the compact forms u & o are defined in the SIP-Specific Event Notification draft; i, m, e, l, c, o, f, s, t, & v are defined in the SIP spec/draft.  I could not find the exact document where the compact form k was defined (besides the list, of course).

What about the compact forms, r (Refer-To) and b (Referred-By), respectively defined in "The Refer Method" draft (draft-ietf-sip-refer-04) and "The Referred-By Mechanism" draft (draft-ietf-sip-referredby-00)?  Are these compact forms not included in the list above due to the fact that their respective documents have not been submitted to be published as proposed standards?  Since these compact forms have been defined in drafts, are these letters/compact forms reserved for the proposed usage?  If not, is it likely that these letters/compact 
forms will be reserved in the future and included in the list above?  I 
did note that both of these drafts state that the compact forms should be added to the list above.

Thanks,
Kosta






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