The 14-Day Voice Agent Playbook

This is the exact playbook I run on every Voice Agent Launch engagement. Steal it, run it on your own business, ship it. Or hand it to me and I will ship it for you in 14 days.

What you are building

A voice AI that picks up your business phone number, handles inbound calls intelligently, qualifies leads, books on your calendar, transfers complex calls to a human, and hands you a daily transcript and summary. Live 24/7. Sounds human enough that customers do not realize until you tell them.

What you need before day one

• A business phone number you control (or willingness to port one)
• A Vapi account ($20/mo to start) or equivalent
• A calendar integration (Cal.com, Google Calendar, Calendly)
• A CRM or destination for leads (Supabase, HubSpot, Airtable, Google Sheets all fine)
• A clear definition of who is calling and what they want

The last one is the only hard part.

Day 1-2: ICP and intent map

Sit down and write out, in plain English:

1. Who calls this number? (Existing customer, new lead, vendor, wrong number, support)
2. What are the top 5 reasons people call?
3. For each reason, what is the ideal outcome? (Booking, qualification, FAQ answer, transfer, capture-and-callback)
4. What is the warmest possible greeting?

This is the spec. Most teams skip it and try to "tune" later. Tuning never works without the spec.

Day 3-4: Build the agent

In Vapi (or equivalent):

1. Create a new assistant.
2. Set the system prompt to a structured version of your intent map. Include guardrails ("Never quote prices. If asked, say I will pass that to my team.").
3. Wire functions: book-appointment, capture-lead, transfer-to-human, send-info. Each function calls a webhook that hits your backend.
4. Pick a voice (test 5, pick the one that sounds most like your brand).
5. Set call termination rules (max length, hang-up on silence).

This takes a focused day if the spec is clean.

Day 5-7: Wire integrations

Build webhook endpoints for each function. Minimum:

• POST /api/voice/book - takes a time, books on Cal.com or Google, returns confirmation
• POST /api/voice/lead - takes name/phone/email/intent, writes to your CRM
• POST /api/voice/transfer - returns a phone number to transfer to
• POST /api/voice/end-of-call - takes the transcript and summary, writes to your DB or sends to Slack

The webhook contract is the only place agent failures show up. Log everything. Use Trigger.dev for retries.

Day 8-10: Test with real calls

Call the number 50 times. Yes, 50. Here is what to test:

• Happy path booking
• Asking for things the agent cannot do
• Talking over the agent
• Long pauses
• Strong accents
• Background noise
• Asking about pricing (verify guardrail holds)
• Trying to escalate emotionally
• Asking to talk to a human

Every failure becomes a tweak to the system prompt or a new function. Iterate until 90 percent of calls produce the intended outcome.

Day 11-12: Port the number

Port your business line or set up call forwarding to the Vapi number. If you are nervous, fork: forward only after-hours calls for the first week, then expand.

Day 13: Soft launch

Tell your team. Watch the first 20 live calls. You will see things tests did not surface. Tweak overnight.

Day 14: Public

Update your website with the number, add it to email signatures, tell your customers. Set a daily review of the transcripts for the first 30 days.

What this costs you to run

• Vapi: ~$0.05/min of call time
• Phone number: $1-3/mo
• Backend infra: $20/mo on Vercel/Supabase
• Total for a service business doing 200 calls/mo at 4 min each: about $50/mo

What it returns: every call answered, every lead captured, every appointment booked. For most service businesses, that is the difference between a $300K and a $500K year.

Want this shipped for you?

We do this in 14 days flat. Includes the agent, the integrations, the analytics dashboard, 30 days of post-launch tuning, and team training. Quoted per engagement after a free discovery call. Start here.

If you want to ship it yourself, this playbook is the whole thing. Ping me on X when yours is live and I will share it.