cross domain freebusy lookups

The iSchedule specification is the basis for cross domain exchange of iTIP messages, starting with freebusy requests (i.e userA@domainZ.com  wants to know the availability of userB@domainY.com).

The spec encompasses discovery (using DNS SRV records + Well-Known URI), cross domain authentication  (based on DKIM), and the actual exchange of iTIP messages between client and server.

iSchedule is not meant to be used directly by browser based applications or Calendar User Agents.

The following post by Rob Yates describes an alternative mechanism (a reference to the Freebusy Read URL would probably belong there), that could be used by browser based application to retrieve freebusy info.

Still trying to understand whether there is a partial overlap between the two approaches.

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