What building your own actually involves
The platforms make the first call look easy, and it is. Making it reliable is the work:
- Get a phone number. Most voice AI platforms only sell US numbers. For an NZ number you buy one from a phone provider, connect it to the platform, then forward your business line to it.
- Write the script. Your services, prices, hours, suburbs, policies, and what to say when it doesn't know.
- Connect your calendar or software. Often through Zapier or Make, which adds another monthly subscription and more things that can break.
- Set up transfers and urgent calls. Who gets called, when, and what happens if they don't pick up.
- Test it properly. Accents, background noise, people who change their mind, people who ask for a person. Platforms bill test calls at full price.
- Keep it right. Read transcripts, fix wrong answers, update prices and holiday hours, and make sure every message reaches someone.
What the platforms charge
Official pricing pages, checked 17 September 2026, in US dollars:
| Platform | What they publish |
|---|---|
| Vapi | US$0.05 a minute platform fee, plus speech, AI model and phone charges at cost. About US$0.08 to US$0.14 a minute all-in. |
| Bland AI | US$0.12 to US$0.14 a minute including the AI model and voice, plus transfers and phone charges. |
| ElevenLabs Agents | Plans from US$6 a month with included minutes, then US$0.08 a minute, plus the AI model and phone charges. |
| OpenAI and Google | Priced per token of audio, not per minute. Model cost only: you also pay for phone lines and building the rest. |
| Twilio (NZ number) | About US$3.15 a month for a local number, and about US$0.01 a minute for incoming calls. |
Prices change often, so check the current pages before you choose. On top of these, booking automation tools run from free to about US$30 a month.
The hidden work
People who have built their own describe the same things. Days of prompt tuning rather than the five-minute setup they were promised. Calling their own agent dozens of times. And problems that only appear with real callers: a message that never reached staff, a booking confirmed that didn't exist, a callback scheduled for 2am because nobody set the time zone.
The most useful comment we found came from a business owner: the AI is 20% of the job, and 80% is what happens after the call. Someone has to make sure every lead gets followed up, every week.
There's a middle option
Self-serve AI receptionist apps sit between building from scratch and done-for-you. You pay a monthly plan and configure it yourself through their dashboard. They're quicker than building from scratch, but the testing and upkeep are still yours. Our FirstVoice vs Talkify comparison looks at one NZ example.
When to build it yourself
- You enjoy the technical side and have time to test and maintain it.
- Your calls are simple, like opening hours and taking a message.
- You don't need bookings in industry software like Cliniko, ServiceM8 or Fergus.
- You're comfortable being responsible for privacy notices and where recordings are stored.
When done-for-you makes more sense
- Your time is better spent on customers than on prompts.
- Calls involve bookings, urgent jobs or anything that must reach a person.
- You want it tested before real customers hear it, and fixed when something changes.
- You want an NZ number and your existing software connected without working it out yourself.
FirstVoice is done-for-you: we build, test and look after your AI receptionist, with setup included from $297 a month. See how it works or compare plans.