CORNERSTONE PLAYBOOK

A voice receptionist that sounds like your best front-desk — not a chatbot.

A 24/7 voice agent trained on your business that answers every call, books appointments, and never sounds like a chatbot. Most voice AI sounds like voice AI. We train yours on your tone, your offer, your service area, and your top 100 caller questions — so the first 15 seconds don't tip the caller off that it's not…

The problem, precisely

Service businesses lose 10–30% of revenue to missed calls — calls that ring out at lunch, after 5pm, on weekends, or when your front-desk person is on the other line. The conventional fixes all fail in their own way. Answering services charge $1.50–$3.00 per call and read from a script that has nothing to do with your offer; they take messages instead of booking jobs. Off-the-shelf voice AI products like CallRail or RingCentral's auto-attendant are glorified voicemail trees — they don't understand intent, they can't qualify a job, and they definitely can't book against your real calendar. And the new wave of 'AI receptionist' SaaS tools sound robotic because they ship with a generic prompt and a generic voice, and they never see your historical call transcripts.

How we build it

We build the voice agent on a stack we've tuned over 18 months: Twilio for the phone leg, Deepgram Nova-3 for streaming speech-to-text (sub-300ms partial latency), Anthropic Claude 3.5 Sonnet for the reasoning layer with a system prompt fine-tuned on your transcripts, Cartesia Sonic-2 for the voice (warmer than ElevenLabs at half the per-minute cost), and a Retrieval-Augmented Generation layer over Pinecone holding your service menu, pricing tiers, hours, service area, escalation rules, and FAQ knowledge base. Booking is handled live mid-call via direct API integration into Jobber, Housecall Pro, ServiceTitan, Acuity, Cal.com, or whichever calendar you actually use — not a 'we'll get back to you' handoff. Tone is trained from 2 hours of recorded calls between you and your real customers, so the model picks up the cadence, the slang, the way you handle objections. Edge cases (Spanish-speaking caller, hostile caller, caller asking about a service you don't offer, caller who needs to be escalated to a human) get explicit handlers, not a fallback to 'I'm sorry, I didn't understand that.' Every call is transcribed, summarized, and pushed to your CRM with disposition tags.

What you get

HVAC dispatch case: 12 missed calls/week recovered × $400 average ticket = $4,800/week in newly captured revenue.

A worked example

An HVAC operator in Phoenix can move from a 14% voicemail-to-callback rate to a 47% agent-to-booked rate in week 2. Net new revenue in month 1: ~$14,200. Cost to operate: $1,997/mo Operators tier. Payback period: 4-7 days.

Cost and timeline

Starts at $4,950 build. Ongoing: $1,997/mo Operators tier · 5,000 min included · $0.40/min overage. Ships in 21 days. Delivered as AI Voice Receptionist, available across United States, Canada.

Will my callers know it's not a human?

If we do our job right, no — at least not in the first 15–20 seconds, which is the only window that matters for caller retention. We voice-match and tone-match from your own call recordings. Some agents prefer transparency and start with 'You've reached the [Brand] AI assistant — I can book service, answer questions, or get you to [Owner Name].' Both modes work; we A/B test for your business.

What happens if the agent doesn't know an answer?

It escalates. We define escalation triggers explicitly: out-of-scope job, hostile caller, request for the owner by name, mention of legal/refund/complaint, or simple low-confidence on the model's part. Escalation goes to whoever you designate — phone call to your cell, SMS with caller details, or a queued voicemail. Default: never let an unhandled call die on the line.

Does it integrate with my dispatch software?

Yes. We have production integrations with Jobber, Housecall Pro, ServiceTitan, FieldEdge, Acuity, Cal.com, Google Calendar, and HubSpot. For anything else we wire it via n8n or Make.com — usually a 2-day add-on. Calendar conflicts, service-area boundaries, and pricing tiers all respected live mid-call.