AI Voice Sales Outreach Engine

n8n workflow that turns a new CRM lead into a personalized ElevenLabs voicemail in ~10 seconds — LLM script generation, cloned-voice synthesis with tuned settings, S3 delivery, Airtable logging, and cost telemetry per execution.

n8nAnthropic ClaudeElevenLabs (voice cloning)WhisperAirtableAWS S3SlackApollo enrichmentWebhook orchestration

Latency

~10s lead → voicemail

Cost

≈ $0.20 per execution

Voice

Cloned + tuned per persona

Reliability

Retry + error sub-workflow

Project Overview

Webhook-triggered n8n pipeline: normalizes CRM payloads across providers, soft-fails through Apollo enrichment, builds a personalized 70–95 word voicemail script with Claude Sonnet, synthesizes it with a cloned ElevenLabs voice using deliberately tuned stability/similarity/style settings, uploads the MP3 to S3, logs the record to Airtable, and fires a Slack notification with per-execution cost tracking. Error sub-workflow posts failures to #automation-alerts with a direct execution link.

Challenge

Sales outreach via cold email has declining open rates. Personalized voicemails convert better but are impossible to produce at scale without automation.

Solution

Built a fully automated n8n pipeline that generates a personalized voicemail script with Claude, synthesizes it in a cloned voice with fine-tuned ElevenLabs settings, and delivers the audio URL back to the CRM within 10 seconds of a lead event.

Results

End-to-end working pipeline with per-execution cost telemetry, production-grade error handling, and a tuning rationale validated through blind A/B listener tests across 12 voice setting combinations.