RFC 3261 section 13.2.2.3 says

   4xx, 5xx and 6xx responses may contain a Contact header field value
   indicating the location where additional information about the error
   can be found.

But table 2 indicates it is only legal in a 485 response.

      Header field          where   proxy ACK BYE CAN INV OPT REG
      ------------          -----   ----- --- --- --- --- --- ---
      Contact                 R            o   -   -   m   o   o
      Contact                1xx           -   -   -   o   -   -
      Contact                2xx           -   -   -   m   o   o
      Contact                3xx      d    -   o   -   o   o   o
      Contact                485           -   o   -   o   o   o

The statement does not contain normative requirements language, but is
inconsistent with the table. It seems that "Contact" should be replaced by
"Error-Info" since it talks about getting additional info about the error
which is exactly what the Error-Info is for.

Is this a bug?

cheers,
(-:bob

Robert F. Penfield
Chief Software Architect
Acme Packet, Inc.
71 Third Avenue
Burlington, MA 01803
[EMAIL PROTECTED]

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