I've been developing 3rd party apps to interface with the voice agents I've created. However, there are errors connecting. I've used the AskAI tool and it says I need to configure server settings for where webhooks are sent and order preference is assistant.server.url, phoneNumber.serverUrl and org.serverUrl and that I need to confirm message configuration clientMessages and serverMessages and Transport Configuration for providers that will handle the assistant's calls. Do I need to have a number set up to deploy an assistant that will only interface via an app with a microphone button (like the Vapi.ai demo)? Are the above configurations made via the backend code? Or are they set in the dashboard for the assistant? For example, must I create a tool with a schema for the AI to interact with the app? Or update the system prompts? Or are there other settings I am overlooking?

- For using with webcalls you don't require a phone number. - The configurations you mentioned are doable using dashboard. - For creating it's best to use API. - Yeah it's good to update prompts using dashboard. Do let me know if you require further help.

Is it possible to include JSON payloads in the prompts to have the agent interact with a webhook without using custom tools?

No it is not possible you have to use tools calling.