Builds / Voice Front Desk
Voice Front Desk
A phone agent that answers, books, and routes calls.
Advanced build · Support & voice · 6 parts · Running cost: No listed price + model usage
Callers get a natural voice that understands them, checks the calendar, and books or routes — around the clock. Built from specialist layers rather than one black box.
Kit. You pick every part and run it yourself. Any model, any server, any search — and the bill is the sum of the parts.
What drives the cost: Medium — per-minute voice pricing
Recommended after Support Desk Agent.
The parts
Voice agent
Retell AI — Tool. Orchestrates the live call: turn-taking, interruptions, latency.
Brain
GPT-5.6 Sol — Model. Low-latency reasoning that keeps the conversation moving.
Alternatives: Gemini 3.8 Live, GPT-5.6 Luna
Speech-to-text
Deepgram — Tool. Accurate live transcription, even on bad lines.
Alternatives: AssemblyAI, Rev AI
Voice
ElevenLabs — Tool. A voice callers don't immediately clock as a robot.
Alternatives: Play.ht, Resemble AI
Phone lines
AgentPhone — Tool. Numbers, routing, and telephony plumbing for AI agents.
Alternatives: Plivo
Calendar (optional)
Google Calendar — Skill. Real availability, real bookings.
Run this build
Start the build and it becomes a checklist: for each part, mark the one you already have, pick an alternative of a kind the slot takes, or compare the options side by side; for a plan, a channel or a policy, choose one of the options. Every part you confirm goes onto your stack, and the build is complete when every required part is filled.
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