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SphereShield eDiscovery can also capture communications from meetings that are hosted externally even if the domains are not federated.
Identifying and handling meeting and recurring meetings
Each meeting contains multiple calls.
A meeting is identified by meeting-ID
A call is identified by call-ID
Each session has meeting id and call id, so each call has a separate session in the eDiscovery DB
Recurring meetings are in fact the same meeting with multiple calls done every week.