One of the Microsoft Teams features that I like the least is call history, for a number of reasons firstly its quite limited only 30 days worth of data and only includes direct calls and not meetings (which are often just scheduled calls). So when it comes to actually answering a question (like the one I found myself asking last week) when did I last have a call or meeting with person X it can't be used to answer this question. The other thing is having that information available in the context of Outlook/OWA is a lot more useful for me (anyway) then digging through anther client to find its doesn't answer the question anyway. However while the call history in Teams only goes back 30 days the Teams CDR (Call Data Records) which I covered in https://dev.to/gscales/accessing-microsoft-teams-summary-records-cdr-s-for-calls-and-meetings-using-exchange-web-services-3581 do go back as far as your mailbox folder retention period. So with a little work I can use Exchange Web Services
Pushing the Envelope in Messaging and Office 365 Development