Scenario if you need the transferredFrom. less say you have not onlhy business A but also business X, both to the same number, if you need to know number A or number X to map the caller to it later. [Twillio Webhook] A call comes in ( here you put your server) when you receive the request from twilio there you capture the TransferredFrom that comes in the body of the request and the callSid of twilio and store somewhere, then pass exactly the request as it came to the vapi ( https://api.vapi.ai/twilio/inbound_call ) now when you receive the assistant-request, you get the callSid in there, thats your option to map the transferredFrom number, hope it makes sense, Maybe there is a less messy way to do this, but is the solution i came up with for my case.