Building AI Receptionists: The Hard Part Is the Orchestration
Understand that building AI is easy, but orchestrating infrastructure takes 6‑8 months and a 1000 ms latency budget.
Document your AI orchestration plan, including latency budgets, state management, and monitoring.
Summary
Building an AI receptionist is no longer the hard part; the surrounding infrastructure is.
The article outlines a 1000 ms total latency budget, a 6‑8 month orchestration build, and eight hidden layers that go beyond the 30‑second demo. Telephony details include SIP trunking, STIR/SHAKEN attestation, inbound provisioning, outbound caller‑ID verification, DTMF detection, and state‑compliant call recording. Audio infrastructure covers voice‑activity detection, barge‑in handling, echo cancellation, silence detection, and dropped‑audio recovery.
Tool reliability is highlighted by CRM API timeouts and idempotency issues that caused customers to be booked before the API wrote the record. State management must handle call drops, handoffs, retries, and prevent duplicate bookings. Escalation logic and monitoring require system health, leading indicators, and business outcome metrics to detect failures. The author cites a real‑world case where a 2.4‑second latency and mismatched webhook signing caused a year of production headaches, underscoring that a $300/month demo is not the same as a production‑ready system.
Key changes
- 1000 ms total latency budget split across STT, LLM, tool calls, TTS, and telephony round‑trip
- 6‑8 month orchestration build required before production
- Eight hidden layers: telephony, audio, latency, tool reliability, state management, escalation, monitoring, model drift
- Telephony layer includes SIP trunking, STIR/SHAKEN attestation, inbound provisioning, outbound caller‑ID verification, DTMF detection, and state‑compliant call recording
- Audio infra provides voice‑activity detection, barge‑in handling, echo cancellation, silence detection, and dropped‑audio recovery
- Tool reliability issues such as CRM API timeouts and idempotency can cause false booking confirmations