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List:       sip-implementors
Subject:    Re: [Sip-implementors] What is the difference between 408 and 504 responses
From:       seshagiri <seshgirik () gmail ! com>
Date:       2012-06-27 17:38:33
Message-ID: CACiuzyZkNnub3SEXDkU2n=N_C4qkciTdbeNr1HrMAv6i7R3bcQ () mail ! gmail ! com
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Thanks for your explanations.
On Jun 27, 2012 4:58 PM, "Brett Tate" <brett@broadsoft.com> wrote:

> > What is the difference between 408 and 504 responses?
>
> The following are from RFC 3261.  However because RFC 4320 unfortunately
> deprecated the 408 for non-INVITE requests (even when the reason cited was
> not applicable), you might see 504 or other status-codes more frequently
> used as an alternative when a 408 actually would have been more
> appropriate.  My concerns about the deprecation were raised during the
> following the thread:
> http://www.ietf.org/mail-archive/web/sipcore/current/msg02421.html
>
> 21.4.9 408 Request Timeout
>
>  The server could not produce a response within a suitable amount of
>  time, for example, if it could not determine the location of the user
>  in time.  The client MAY repeat the request without modifications at
>  any later time.
>
> 21.5.5 504 Server Time-out
>
>  The server did not receive a timely response from an external server
>  it accessed in attempting to process the request.  408 (Request
>  Timeout) should be used instead if there was no response within the
>  period specified in the Expires header field from the upstream
>  server.
>
>
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