[Sip] Bug (editorial nit) in 3261

[Adam Roach <adam@dynamicsoft.com>]

Just posting here to request a new bug to be opened against
RFC 3261.

21 Response Codes

   The response codes are consistent with, and extend, HTTP/1.1 response
   codes.  Not all HTTP/1.1 response codes are appropriate, and only
   those that are appropriate are given here.  Other HTTP/1.1 response
   codes SHOULD NOT be used.

Strictly speaking, this is no longer true -- and I suspect time will
make it less and less so.

Compare, for example, SIP "416 Unsupported URI Scheme" with
HTTP "416 Requested Range Not Satisfiable".

We should open up a bug against the spec to revise this language
when we open it for revisions again. 

If complete consistency is required, we need to renumber SIP 416,
and develop some sort of joint IANA registry (in conjunction with
and with the buy-in of the HTTP community) to prevent these types
of collisions in the future. Given how disruptive such a change
would be, I suspect we should just let the number spaces diverge.

/a
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