Building an AI Voice Agent That Never Misses A Call (NZ Accent)

Disclaimer: This article was AI generated from my YouTube video transcript.

Picture this: a lead lands on your website on Friday night at 9pm. You can’t always be there to respond. By Monday morning, they’ve already chosen the competitor that got back to them faster. That’s the reality for most NZ businesses - speed to lead makes or breaks whether you win the work. The good news is AI can handle this for you. A personalised text message, an instant phone call from a Kiwi-accent voice agent, and a booked meeting all happen automatically while you’re asleep.

I brought on Finn from Minimize AI, a New Zealand team that specialises in speed-to-lead AI systems, to walk through exactly how they build these for clients - so you can build one yourself.

Why Speed to Lead Matters

Three organisations ran a three-year study on 15,000 leads across six companies and the numbers are eye-watering:

Reach a lead within the first hour and you’re 10x more likely to actually have a conversation with them.
Reach them within the first 5 minutes and you’re 21x more likely to qualify them as a real opportunity.

Why? Because in the moment a lead fills out your form, your business is the most important thing on their mind. Five hours later they’re thinking about dinner, friends, or a meeting at work - and your offer has dropped to the bottom of the priority list. Catch them while the emotion is hot.

The Tools You Need

n8n - the automation engine that ties everything together.
Retell AI - the voice agent platform.
Twilio - to buy a real New Zealand phone number for the agent.
ClickSend - the SMS provider for the instant text.
Tally - the form software (any form tool with webhooks works).

Step 1: Build the n8n Workflow

Sign up to n8n and create a new workflow. Finn provides a Speed to Lead document with a pre-built workflow you can copy and paste straight into n8n - massive time saver. Drop the workflow in and you’ll see a series of nodes, each handling a different action: capturing form data, parsing the lead, firing the SMS, and triggering the phone call.

Step 2: Connect Your Form via Webhook

The first n8n node listens for incoming form submissions. Click into it, copy the webhook URL, then jump to your form software (Tally in this walkthrough). Inside the form’s integrations tab, find the Webhook connection and paste in the URL.

Back in n8n, click Listen for event, submit a test entry on your form, and watch the data flow through. That’s the form-to-automation handshake done.

Step 3: Parse the First Name and Phone Number

The next node extracts the fields you actually care about - usually first name and phone number. If your form is laid out the same way as the demo, the default JavaScript will work. If it doesn’t, copy the JSON output, paste it into Claude or ChatGPT with the prompt “Restructure this JavaScript so it pulls the first name and phone number”, and drop the new code back in.

Step 4: Set Up ClickSend for the Instant SMS

Sign up to ClickSend and head to Developers › API Credentials › Add Sub Account. ClickSend gives you a username (your email) and an API key (a long string of characters). Back in n8n, create a Basic Auth credential where the username is your email and the password is your API key. Save and execute - your test phone should buzz with a message like “Hey [Name], thanks for reaching out. One of our team will give you a call in just a moment.”

Step 5: Buy a New Zealand Phone Number in Twilio

Twilio is what gives your voice agent a real Kiwi number. Inside Twilio:

Go to Regulatory Compliance › Bundles and create a New Zealand local bundle. Fill in the required address details.
Search for Elastic SIP Trunks and create a new trunk. Call it “demo” or whatever you like.
Buy a New Zealand local number. Assign it to your approved bundle and address.
Configure the number to use the SIP trunk you just created.
Open the SIP trunk, go to Termination, set a unique termination URL (it’ll check availability), enable both default options, and save.

Copy the termination URL - you’ll need it in Retell.

Step 6: Connect Retell AI

Sign up to Retell AI. Go to Phone Numbers › Connect, paste in the Twilio termination URL, then add your purchased phone number. Save.

Now create an agent. Go to Agents, hit create, and paste in the prompt from Finn’s Speed to Lead document - it’s already tuned for qualifying inbound leads. Give it a name (the demo uses “Jeffrey”), connect the phone number you just added, and publish.

Step 7: Wire Retell Into n8n

In Retell, go to Settings › API Keys and create a new key called “demo”. Copy it. Back in n8n, create a new credential called Authorization and set the value to Bearer YOUR_API_KEY (literally the word Bearer, a space, then your key).

Open your agent in Retell, copy its Agent ID from the top of the page, and paste it into the n8n node. Add the same Twilio phone number to the same node. Hit execute and your phone should ring within seconds.

What the Lead Experience Looks Like

From the lead’s perspective:

They submit your form.
Within two seconds, an SMS lands on their phone using their first name and a heads-up about an incoming call.
Moments later, an actual phone call comes through from a real NZ number.
A natural-sounding agent (Kiwi accent if you tune it that way) qualifies them and books a slot directly into your calendar.
If they don’t answer, follow-up systems keep trying to re-engage them until they book.

Compare that to the average Kiwi business response time - hours or days - and it’s easy to see why this stack converts so well.

Key Takeaways

Speed to lead is the single biggest sales lever most NZ businesses are ignoring - 10x contact rate within 1 hour, 21x qualification rate within 5 minutes.
Voice agents don’t have to sound American or robotic. With Retell + Twilio you can deploy a Kiwi-accent agent on a real NZ number.
The whole stack is no-code: n8n + Retell + Twilio + ClickSend + a form tool.
Reuse Finn’s Speed to Lead workflow template instead of building it from scratch.
If a lead misses the first call, automated follow-ups keep trying - you’re not relying on a single shot.

If you want help rolling AI out properly across your NZ business - voice agents, automation, education, custom builds - that’s where I come in. I’ve worked with over 15 NZ companies on exactly this. Reach out via the link in the video description.