I am the assigned Gen-ART reviewer for this draft. For background on
Gen-ART, please see the FAQ at

<http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>.

Please resolve these comments along with any other Last Call comments
you may receive.

Document: draft-saintandre-impp-call-info-02.txt
Reviewer: Elwyn Davies
Review Date: 23 April 2013
IETF LC End Date: 14 May 2013
IESG Telechat date: (if known) -

Summary: Ready. See the generic issue with the IANA registry mentioned below.

Major issues: None

Minor issues: None

Nits/editorial comments:
Generic comment about SIP Header Field Parameters registry: For the uninitiated this registry is rather opaque. Some parameters, such as the Call-Info purpose parameter for which an extra value is defined here, have predefined values. However the predefined values themselves are not in the registry and just giving a whole RFC reference for places where values are defined is not very helpful. For example, in the case of Call-Info, the initial predefined values of purpose are buried in the Call-Info rule in the ABNF in Section 25.1 of RFC 3261; also, Section 20.9 describes the predefined values (such as "icon") as 'parameters' rather than values of 'purpose'. It would probably be helpful to either improve the references in the registry table or actaully quote the possible predefined values in the table.

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