Make outbound sales calls from Google Sheets using a Retell AI voice agent

This n8n workflow automates outbound phone calls to new leads using [Retell AI](https://dashboard.retellai.com/?ref=retell-n8n), with built-in timezone detection to ensure you're only calling during business hours.

Use cases include appointment setting, lead qualification, follow-up surveys, payment reminders, and sales outreach—anywhere you need to scale phone conversations without scaling headcount.

Good to know

- You'll need a Retell AI phone number and configured voice agent before using this workflow. - Retell AI offers $10 free credit when you sign up (~73 minutes of calls). [Create your account here](https://dashboard.retellai.com/?ref=retell-n8n). - The timezone logic covers common country codes (UK, US, EU, Australia, India, UAE, Singapore, Japan). You can extend this in the Code node.

How it works

- A new row in Google Sheets triggers the workflow (you can swap this for a webhook, form, or CRM trigger). - The phone number is sanitised—stripping spaces, dashes, and brackets so it's in the correct format for dialling. - The lead's timezone is determined from their country code, and the workflow checks whether it's between 8am-5pm local time. If not, it waits and retries. - Retell AI places the outbound call using your configured voice agent. - The workflow polls Retell's API until the call ends, then retrieves the transcript. You can replace this with [a Retell webhook](https://docs.retellai.com/features/webhook-overview) if you'd rather. - The Google Sheet is updated to mark the lead as "Called", as well as entering the call summary, transcript, call sentiment, and other useful details from Retell's call logs.

Requirements

- Retell AI account with a phone number and voice agent - Google Sheets with columns: Phone Number, Name, Status