Re: [Sip-implementors] Contact header in 4xx,5xx,6xx responses

[neeraj . chowdhry]

485 Ambiguous is the only 4xx response that must have a Contact header //
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Re: [Sip-implementors] Contact header in 4xx,5xx,6xx responses

[Dale R. Worley]

On Thu, 2005-11-10 at 11:37 -0800, Bob Penfield wrote:
> 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.

Yes, I'd say that that sentence meant to say "Error-Info", as in no
other place is "Contact" described as having a usage like that.

> But table 2 indicates it is only legal in a 485 response.
> 
>   Header field  where   proxy ACK BYE CAN INV OPT REG
>     -   - --- --- --- --- --- ---
>   Contact Ro   -   -   m   o   o
>   Contact1xx   -   -   -   o   -   -
>   Contact2xx   -   -   -   m   o   o
>   Contact3xx  d-   o   -   o   o   o
>   Contact485   -   o   -   o   o   o

>From the descriptions of the 4xx responses in section 21.4, it looks
like 485 is the only 4xx error which has use for Contact.

Dale


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[Sip-implementors] Contact header in 4xx,5xx,6xx responses

[Bob Penfield]

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 Ro   -   -   m   o   o
  Contact1xx   -   -   -   o   -   -
  Contact2xx   -   -   -   m   o   o
  Contact3xx  d-   o   -   o   o   o
  Contact485   -   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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