[CalendarServer-users] Is an XMPP server required to get invites?

[Conrad Wasmer]

My install of the latest revision (5304) of CalendarServer works pretty well, except for the fact that I cannot RECEIVE any invitations in iCal.  Does this require having an XMPP server, and configuring the caldavd.plist accordingly?  

Similarly, replies to invitations from my end are not received - and if I drag and drop a reply into iCal, I have seen some invitations (maybe all) are noted as "cancelled" by calendarserver, even though it has not actually been cancelled.

Any ideas?
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Conrad Wasmer