This is a very good question - one I too have wondered about and don't
know the answer to.
I speculate that the best one could do is to replicate the headers in
the response and hope for the best. The most troublesome one is probably
Via. You really have to be able to interpret that to know where to send
the response.
In my experience, stacks will typically decode (parse) a message into an
internal form, then manipulate the internal form to create a response,
and encode that again when sending the response. Trying to preserve
malformed headers is difficult using this approach. (Consider what to do
with 'CSeq: XYZ' if you intend to carry the cseq value as a binary
number in your stack.)
In any case there is a good chance that the response won't be able to be
processed either.
Paul
chom sri wrote:
> Hi,
>
> RFC 3261 Says that 400 Bad Request should be formed if there is an error
> in Mandatory headers like To,From,Via and Callid etc or if the Mandatory
> headers are missing.
>
> Can someone tell me how to form the 400 message with these malformed
> headers?
>
> Regards,
> Srikanth.
>
>
>
>
> ---------------------------------
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