Re: Duplicate parameter names

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:[email protected];name=value>
> 	<sip:[email protected]?Name=value>
> 	<sip:[email protected]>;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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