Short answer
HubSpot's KB: the call index summarizes inbound and outbound calls placed in HubSpot, including third-party integrations like Zoom and Aircall. Clicking into transcript sections needs Sales or Service Hub Professional or Enterprise.
1. In HubSpot
The relevant screen in my demo portal.

2. Worth knowing
Recorded meetings no longer create duplicate call records here.
3. Related
Call transcripts and the duplicate-call change.