Voice AI Lead Generation at Scale
A multi-agent voice pipeline that qualifies leads, updates the CRM, and books appointments — processing 1,000+ calls a day across 15+ platforms at 99.9% uptime.
Retell AIFastAPIGPT-4n8nGoHighLevel
1,000+
Daily calls
99.9%
Uptime
+45%
Qualification
The Problem
The agency's lead qualification, CRM updates, and appointment booking were manual and couldn't scale. An early version also silently dropped lead data — calls completed on Retell AI but CRM updates failed.
The Solution
- Built the flow: Retell AI voice → FastAPI → GPT-4 classification → n8n orchestration → GoHighLevel pipeline update → SMS/email follow-up → calendar booking.
- Traced the data loss to a race condition — the call-end webhook fired before the conversation summary was ready, producing a malformed payload.
- Fixed it with an async buffer in FastAPI, plus a dead-letter queue and Slack alerting so failures surface immediately.
Results
- 1,000+ calls handled daily across 15+ integrated platforms.
- 45% improvement in lead-qualification accuracy.
- 99.9% uptime with no more silently dropped leads.
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