Layer 1 — VAPI → Phone number connected, 24/7 answering → Prompt tuned to the client’s FAQ, services, pricing → Caller intent detection: booking vs. question vs. complaint Layer 2 — N8N → Webhook fires on call end → Booking intent → GHL contact created or updated → Non-booking → tag + 24h SMS follow-up triggered → Failed call → Slack alert via catch node (3-retry logic) Layer 3 — GHL → Booking confirmation sequence (48h, 24h, 2h reminders) → Pipeline stage updated by call outcome → Dashboard: calls handled, bookings created, revenue attributed Live for a dental clinic. Month 1: 47 calls handled outside office hours. $1,500 in recovered revenue. What stack are you using for your Voice or SMS agents?