I think option tag is necessary if UA that does not understand this specification barfs or breaks by receiving the parameter mentioned.
Regards Shida as an individual. On Nov 9, 2009, at 4:38 PM, Alan Johnston wrote: > Here's an issue Robert has raised that we should have some discussion on > before sending this on the IESG. > > The Shared Appearance draft defines a "shared" event parameter. > > The question is whether this should instead be a SIP feature tag used in a > Supported and Require header fields. > > I've pulled out some text from the draft, RFC 3265, and a summary of how it > is used. > > What do people think? > > Thanks, > Alan > > - - - - - > > From draft-bliss-shared-appearance: > > Section 12.1 > > This specification defines a new event parameter 'shared' for the > Dialog Package. When used in a NOTIFY, it indicates that the > notifier supports the shared appearance feature. When used in a > PUBLISH, it indicates that the publisher has explicit appearance > information contained in the message body. If not present in a > PUBLISH, the Appearance Agent MAY assign an appearance number to any > new dialogs in the message body. > > From RFC 3265: > > 4.4.2. Event Package Parameters > > If parameters are to be used on the "Event" header to modify the > behavior of the event package, the syntax and semantics of such > headers MUST be clearly defined. > > Details on the usage: > > - Appearance Agent discovery of non-Shared Appearance UA during > subscriptions. A NOTIFY sent without <appearance> elements does not > necessarily mean the UA does not understand or support the extension, but a > NOTIFY sent without the Event:dialog;shared does indicate this. > > - Sent by a UA and interpreted by an Appearance Agent to request no > appearance number be assigned to a dialog (PUBLISH sent without <appearance> > attribute but containing Event: dialog;shared > > > _______________________________________________ > BLISS mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/bliss _______________________________________________ BLISS mailing list [email protected] https://www.ietf.org/mailman/listinfo/bliss
