You have to leave the assistant in blank and make the assistant assignation dynamically on a custom api you set as server url on the main settings of your organization, everytime a call is received the server url is requested, then you have to assign the desired assitant id for the call and use dynamic variables, those dynamic variables can be used on the prompt as {{name}} for example https://docs.vapi.ai/assistants/dynamic-variables https://cdn.discordapp.com/attachments/1243025299361370176/1304996218274840636/image.png?ex=67316bf0&is=67301a70&hm=215956f8629349f78779c18f5bb5c2ea5d45d2e6bc06e932982eb61501529861&