Any header which uses the "repeated field separated by comma" format can
be repeated either via the comma for by multiple instances of the
header. It spells this out somewhere in 3261.
In theory I think some form of header that doesn't meet that requirement
might also be allowed to be repeated, but I can't think of a case of
that right now.
You are discovering that the ABNF isn't a complete specification of the
syntax. It doesn't cover this sort of thing.
Paul
Iñaki Baz Castillo wrote:
> Hi, AFAIK headers "Via", "Route" and "Record-Route" can appear multiple times
> in a message (not just multiples values in each header), for example:
>
> INVITE sip:asdasdasd SIP/2.0
> Via: xxxxxxxx, xxxx
> Via: xxxxxxx
> Via: xxxxxxxxxxx
> ...
>
> I don't find in RFC 3261 which exact headers can appear multiple times in a
> message. For example: can "Require" header appear multiple times? Considere
> this case:
>
> INVITE sip:qweqweqwe SIP/2.0
> Require: replaces
> Require: wrong_value
>
> Should the UAS reply 420 (Bad Extension) because the second "Require" is
> wrong? or should it accepts the message since the only "Require" header it
> must inspect is the first one?
>
> Any point to RFC 3261 is welcome :)
> Thanks for any explanation.
>
>
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