Hello George,
I think the Contact is an exception which doesn't
fit to the rule you mention
Looking at section 7.3 of RFC 3261:
header field. That applies to SIP as well, but the specific rule is
different because of the different grammars. Specifically, any SIP
header whose grammar is of the form
header = "header-name" HCOLON header-value *(COMMA header-value)
allows for combining header fields of the same name into a comma-
separated list. The Contact header field allows a comma-separated
list unless the header field value is "*".
Note that the last part allows contact header fields to have
comma-separated lists.
Also note that the grammar directly implies that
this can be a comma separate list:
Contact = ("Contact" / "m" ) HCOLON
( STAR / (contact-param *(COMMA contact-param)))
contact-param = (name-addr / addr-spec) *(SEMI contact-params)
Regards,
Attila
Attila Sipos
Software Engineer
www.vegastream.com
> -----Original Message-----
> From: George Petrov Georgiev-Rusiichev [mailto:[EMAIL PROTECTED]
> Sent: 30 October 2003 08:55
> To: [EMAIL PROTECTED]
> Subject: [Sip-implementors] question about Contact header
>
>
>
> Hi all
>
> Is there anybody who can give me an idea whether Contact: header
> could exist as a multiple header field rows. In RFC3261 is
> written :
>
> Multiple header field rows with the same field-name MAY be present in
> a message if and only if the entire field-value for that
> header field
> is defined as a comma-separated list (that is, if follows
> the grammar
> defined in Section 7.3).
>
> And the grammar for Contact: is
>
> Contact = ("Contact" / "m" ) HCOLON
> ( STAR / (contact-param *(COMMA contact-param)))
>
> which doesn't match
>
> header = "header-name" HCOLON header-value *(COMMA header-value)
>
>
> The problem is that there are many servers that puts Contact:
> in multiple header
> field rows e.g. SIP Express router (SER)
>
>
> Thanks in advance
>
>
> --
> George mailto:[EMAIL PROTECTED]
>
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