We are not sure about ring central back end application architecture. But they are maintaining different data centers to give response to their clients.
Could you pls explain what is the need of such requirement to know the internal db system of Ringcentral?
If you really want to know the internal details, you can always contact backend developer support team at email@example.com and get those details.
As far development is concerned, you will get all the data via Ringcentral APIs as the entire system is cloud API based. You can integrate these APIs in your programing language and get these communication services and it actually doesn't require to know where actually the data is stored.
You can store those call details into your db or export to a file.
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