Built a production AI voice calling agent that autonomously pre-qualifies leads over the phone — no human needed on the line. The agent calls prospects from an enriched list, conducts a natural qualification conversation using a fine-tuned voice AI model, extracts key intent signals from the call, scores each lead as Hot / Warm / Cold, and instantly routes qualified leads to the sales team via CRM update and Slack notification. The entire workflow from list upload to qualified lead delivery — runs inside n8n. The client's sales team went from spending 6 hours per day on cold pre-qualification calls to receiving only pre-scored, context-rich leads ready to close. Call transcripts and scores are logged automatically for every single dial. Integrated with: Vapi (voice AI), n8n (workflow), HubSpot (CRM), Slack (alerts).