### Answer For CSV uploads in Batch Calling, here are the requirements to check: CSV Format Requirements: - The CSV must have a header row including a "phone number" column [(1) ]() - Phone numbers should be in E.164 format (which your

+11233456789

format appears to follow) - You can download the template by clicking "Download the template" in the UI to ensure proper formatting - Maximum file size is 50 MB [(2) ]() If your numbers aren't in E.164 format: - You can add a column to the CSV named

ignore e164 validation

with value

true

[(1) ]() - Note: This only applies when using custom telephony, not Retell Telephony Troubleshooting suggestions: 1. Verify your header row says exactly "phone number" (check for typos or extra spaces) 2. Try downloading and using the official template from the dashboard 3. Ensure there are no hidden characters or formatting issues in your CSV If the issue persists after checking these items, could you share more details about any error message you're seeing?

​ To learn more, see the sources I considered: [[1] Create Batch calls](https://docs.retellai.com/deploy/make-batch-call) [[2] Streamline Calls with Retell AI’s Batch Dialer | Retell AI](https://www.retellai.com/blog/boost-operation-efficiency-with-retell-ais-batch-calling) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.