[Sip] Question on RFC3840/3841

"Christer Holmberg" <christer.holmberg@ericsson.com> Wed, 09 January 2008 10:24 UTC

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Date: Wed, 9 Jan 2008 11:24:28 +0100
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Thread-Topic: Question on RFC3840/3841
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From: "Christer Holmberg" <christer.holmberg@ericsson.com>
To: <sip@ietf.org>
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Cc: Paul Kyzivat <pkyzivat@cisco.com>
Subject: [Sip] Question on RFC3840/3841
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Hi,


Chapter 9 of RFC3840 says:

"There are additional constraints on the usage of feature-param that
cannot be represented in a BNF. There MUST only be one instance of any
feature tag in feature-param."


Chapter 10 of RFC3840 says:

"Furthermore, there can only be one instance of any feature tag in
feature-param."



So, this means that the following is NOT allowed:

Accept-Contact: *;myTag,myTag


However, since an Accept-Contact header can contain multiple ac-values,
each with its own sets of ac-parameters (including feature-params), the
following should be allowed:

Accept-Contact: *;myTag, *;myTag

...or:

Accept-Contact: *;myTag
Accept-Contact: *;myTag


Correct?


Regards,

Christer





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