Replay
Voice receptionist replay: "Watch Harper take a call"
A real run, replayed: a recorded call of 1 min 54 s over 14 turns, with a median 0.7 s to first audio.
A voice bot that calls a real phone and handles the conversation.
For owners who want to hear it on a real phone: the bot verifies the number with a six-digit code, then calls it and says it is an AI in its first sentence.
Phone call demo Book a live run-through Checked
A demo bot on a phone line, a minute into a recorded call
A real call to a demo phone line, replayed with captions; Harper looks things up while the caller waits.
How the call works
A lead fills in your form, then waits for a callback. Some give up and call the next business. We build voice bots that ring first, ask the right questions and save the answers. This build shows one on a real phone, playing a plumbing company.
- Your number
- The code
- The call, up to 60 s
- 60 shard stop, hung up before it
- 1 callper number per day
- Verifiednumber only, by a texted code
- AI firstsays it is an AI in its first sentence
Checked Built with code verification and a 60-second cap.
Built and guarded: code verification on the number and a 60-second cap on every call.
- You prove the number is yours. Enter a US mobile number, then confirm the six-digit code sent to it. No code, no call. [Twilio Verify]
- The bot rings that number and says it is an AI in its first sentence. An AI voice model answers what you say, live.
- You can replay the recording and delete it.
A bot that phones people needs hard limits. We also build the phone side: calls over the internet [VoIP], with a browser phone like the one shown below.
Guardrails built in
These limits are built into the code.
- Only your number. The call goes to the number whose code you confirmed.
- Sixty seconds at most. The server hangs up before the 60-second mark.
- Told up front. The bot says it is an AI in its first sentence.
- One a day. Each number gets one call per day.
- Kill switch. An off button the owner can press stops the demo.
- Your recording. You can replay it and delete it.
The voice on the line is an AI, and it says so. It plays a plumbing company and never poses as a person. Your number goes to Twilio, the calling service, to send the code and place the call.
The server keeps only a scrambled fingerprint of it, to enforce one call a day. Its saved records hold fingerprints only, and the plain number stays in memory just while the code check and the call run.
- 0 sThe verified number rings. No other number can be called.
- First sentenceThe bot says it is an AI, then answers for a plumbing company.
- Before 60 sThe server hangs up. Twilio has its own time limit as a second line.
Book a live run-through
We run the phone-call build with you live: you verify your number, the bot rings it and says it is an AI in its first sentence, and you hear it answer what you say.
Before a callback bot, a lead fills in a form and someone calls when they are free. Each caller gets different questions, and notes live in a head or an inbox. We build the version that rings when the form arrives. It asks the same questions every time and saves the answers as a record you can search.
On the recorded call, the median time to first audio was 0.7 s. Harper's written instructions held 12 numbered security rules, and Harper said it was an AI.
We have built voice bots that take real calls.
Hear the recorded call now
Harper is a receptionist styled after a property agency's front desk. On a recorded call it said it was an AI, asked what the caller needed and looked things up while the caller waited.
The recorded call replay plays with captions. Harper runs two web searches, declines to rate school districts and points to official sources.
The browser phone behind it
We also built a separate browser business phone, where your phonebook, notes and call log sit together. We run our own business line on it.
The built phone supports hold and call waiting. It also checks the calling provider's signed messages to confirm who sent them. Incoming calls ring recently active devices and fall back to a cell phone. [Twilio, webhook signatures]
See the demo collection for other examples.
Replay
Browser business phone (console dialer)
An interactive example: a browser phone built on four runtime libraries, passing 44 of 44 of its own checks.
Tell us what you would change
Tell us where your leads come from and how fast you reply today. We reply with what a callback bot would change.