How can identify existing clients by phone number? For AI to remember previous conversations in some way

ccing: @Kings_big💫

By phone number using Vapi’s Server URL to fetch past conversations from your database and inject summaries into the assistant’s prompt for memory.

Should I do that on my webhook on the 'assistant-request' message type ? Will it not start assistant until I send response to this?

Yes, you should use the assistant-request webhook to fetch past conversations by phone number, inject a summary into the assistant’s prompt, and note that the assistant won’t start until you send your response with the customized configuration.