iTIP
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... defined in the iCalendar Transport-independent Interoperability
Protocol (iTIP) defined in [ITIP].
...
... other specifications, such as the iCalendar Transport-independent
Interoperability Protocol (iTIP) defined by [ITIP].
...
... Silverberg, S., Mansour, S., Dawson, F. and R. Hopson, "iCalendar Transport-Independent Interoperability Protocol (iTIP) : Scheduling Events, Busy Time, To-dos and Journal Entries", RFC 2446prop, November 1998. ...