Vapi is the Voice AI platform for developers.

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I need to develop an automated customer support system that integrates VAPI (Voice API) and Twilio to handle inbound and outbound calls using customer data stored in a CSV file. The primary objective is to detect inbound phone numbers, match them with customer records, greet the user by name, and provide requested information.

- use transient assistants for inbound calls 
https://docs.vapi.ai/server-url/events#retrieving-assistants
-  use dynamic variables for feeding customer data
https://docs.vapi.ai/assistants/dynamic-variables

Whenever a inbound call is placed you have to pass your assistant config with dynmaic data either using assistant overrides or the assistant itself and it will work.

Same can be done for outbound call as well/

- You have to set a org wide url for the inbound calls.