The docs are probably not up-to-date as the transfer call tool doesnt work with multiple destinations without arguments. It works only when configured like this, with function.parameters.properties.destination https://docs.vapi.ai/call-forwarding while in the https://docs.vapi.ai/api-reference/assistants/create and https://docs.vapi.ai/api-reference/tools/create the function.parameters are not mentioned at all