Per the previous email from Frank Dawson and my reminder last week. I added the following to CAP "2.1.X New Properties (summary)"
ATT-COUNTER - When storing a "METHOD" property with the "COUNTER" method, there needs to be a way to remember who sent the COUNTER. The ATT-COUNTER property MUST BE added to all "COUNTER" [iTIP] components by the CUA before storing in a CS. (Section 7.2)
Property Parameters: Non-standard property parameters can be specified on this property.
Conformance: This property MUST BE specified in any component with the "METHOD" value of "COUNTER".
Description: This property is used to identify the CAL-ADDRESS of the entity that sent the "COUNTER" [iTIP] object.
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