Re: [Sip] Duplicate parameter names

[Paul Kyzivat <pkyzivat at cisco.com>]

Dale Worley wrote:
> I know that this question has been wrangled over, but I'm having trouble
> determining the proper resolution.
>
> A SIP name-addr has three types of parameter:  URI-parameters, headers,
> and header-parameters:
>
> 	<sip:foo at example.com;name=value>
> 	<sip:foo at example.com?Name=value>
> 	<sip:foo at example.com>;name=value
>
> Which of these admit two parameters with the same name?
>
> RFC 3261 section 19.1.1 clearly specifies that URI-parameters may not be
> duplicated.
>
> RFC 3261 section 7.3.1 implies that headers can be duplicated, because
> in SIP requests some headers can appear more than once even though they
> cannot be combined into a comma-separated list.
>
> But what about the header-parameters?  I can't find any clear statement
> in RFC 3261.  But I'm sure we've discussed this and come to a
> conclusion...

Section 7.3.1 of 3261:

   Many existing header fields will adhere to the general form of a
   value followed by a semi-colon separated sequence of parameter-name,
   parameter-value pairs:

         field-name: field-value *(;parameter-name=parameter-value)

   Even though an arbitrary number of parameter pairs may be attached to
   a header field value, any given parameter-name MUST NOT appear more
   than once.

	Thanks,
	Paul
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