We are not sure about RingCentral's backend application architecture. But they are maintaining different data centers to give response to their clients.
Could you please explain what is the need of such requirement to know the internal database system of RingCentral?
If you really want to know the internal details, you can always contact RingCentral's backend developer support team by submitting a support ticket to get those details.
As far as 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 database or export to a file.
Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.
Download RingCentral Phone for Desktop:
Tip: switch to the "sandbox mode" before logging in the app:
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