đź’¬ Make outbound sales calls from Google Sheets using a Retell AI voice agent
⚡ 474 views · 💬 Lead Nurturing & AI Sales Agents
Description
This n8n workflow automates outbound phone calls to new leads using Retell AI, 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.
- 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 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
Customising this workflow
- Change the trigger: Replace Google Sheets with a webhook, n8n form, or CRM trigger (HubSpot, Pipedrive, etc.)
- Adjust calling hours: Modify the IF node to change the 8am-5pm window
- Expand timezone coverage: Add more country codes to the mapping in the “Get lead’s timezone” Code node
- Add your own AI analysis: We currently use Retell AI’s default call summary - but you could add an agent that extracts different insights (e.g., buying signals, objections)
- Route the output elsewhere: Send results to Slack, a CRM, email, or Airtable instead of updating Google Sheets
Built by Marcus Taylor (@intellagents / voiceai.guide)
đź”— Nodes Used
Google Sheets, HTTP Request, Google Sheets Trigger, Filter
đź“Ą Import
Download workflow.json and import into n8n:
Workflow menu → Import from File