----------------------------- **While I generate an answer, here are some sources that might be helpful**: * [Outbound Calling]() * [Outbound Calls from Python]() * [Glossary]() * [Phone Calling]() -----------------------------

### Answer When facing issues with making outbound calls using Vapi, ensure that you have followed the essential steps outlined in the documentation. The process involves: 1. **Creating an Assistant**: Before making an outbound call, you need to have an assistant created. This assistant dictates how the call will be handled and how the interaction will proceed [(1)]() . 2. **Obtaining a Phone Number**: For making outbound calls, you must have a phone number associated with your Vapi account. This can be a number purchased through Vapi or imported from another provider like Twilio . 3. **Making the Outbound Call**: With an assistant and a phone number ready, you can initiate the outbound call by setting your assistant as the dialer and specifying the destination phone number [(2)]() . Additionally, when working with APIs, especially for outbound calls, ensure that: - The API credentials (Auth token) are correctly set for authentication [(3)]() . - Correct parameters (like

phoneNumberId

,

customer

object) are being used in your API request [(4)]() . If you're still encountering issues despite following these steps, it might be beneficial to review any error messages or logs for more specific guidance. Checking the status of the call in your Vapi dashboard or the API response could provide insights into what might be going wrong. For a more detailed guide on making outbound calls, including example API requests, please refer to the official documentation [(1)]() [(3)]() .

Got it. Tagging @User for additional help.

I think it's the way I inputted the number.

Whenever I manually input the number, it works.

or there's high chance you request contains a invalid syntax