How it runs

From the first ring to the buzz on your phone.

The phone assistant is the easiest piece to picture, so here's the whole path one call takes. The safety net further down covers everything we build.

The path of a call

Five steps, start to finish.

Swipe to follow the call

2:14

Incoming call

(603) 555-0142New Hampshire

The caller ringsFrom a phone, or with one tap on your website.

👂 Ears🧠 Brain🗣 Voice

"Brasswick Plumbing, Sam speaking. Calls are recorded."

The assistant answersIt listens, then replies in a natural voice.

Urgency check

Address on a map

Page the on-call

Book a callback

Your tools do the checkingmeasured Each one answered in 0.17 to 0.6 seconds.

Your records

NameIssueStatus

Gene RicciWater heaterCalled back

WaltWants a personBooked

Carol HayesSlow drainBooked

Your records fill inCustomers land in your Google Sheet. Callbacks land on a schedule.

2:15

Your phone

Brasswick alerts

🚨 EMERGENCY · Burst pipe40 Oak Street, Derry

Join callLater

You get toldAn alert with Join while it's live. Call back once it ends.

Example call. Brasswick Plumbing is a made-up shop.

The assistant, in plain words

What's inside the assistant.

Ears: Deepgram

Writes down what the caller says, tuned with your town names and trade words. A noise filter cleans up road and shop sounds first.

Brain: GPT-4.1

Follows a written rulebook and picks the next move. It only promises what a tool confirmed or what you committed to.

Voice: ElevenLabs

Speaks the reply in a natural voice. If that service has a bad day, a backup voice from another company steps in.

When something breaks

Things break. Here's what catches them.

A spreadsheet hiccups. A messaging app goes down for a minute. None of it should reach your customer, and none of it should stay hidden.

1
3:15 AM · BackupsA copy of every workflow goes into a private history.
2
7 AM · Health checkTwenty-one checks on the server. Joseph hears only if something needs him.
3
Four times a day · Tool checks5:17 and 11:17, AM and PM. Skipped while a call is live.
Every 10 to 15 minutes · The watchLooks for anything that reported success but did nothing.

During every call

A line ready for every hiccup

If a tool can't answer, the assistant gets a clear signal and has a fallback line. It never says "error" to a caller.

"I can't get the schedule up right now, but your details are saved and the team will see them."

Every page

"Paged" only means paged

The assistant says the tech is paged only if the alert really went through. If it didn't, it says so and books the fastest callback.

Any time

Error alerts

Each piece of the system reports its own failures to a separate alert chat on Joseph's phone. Nobody has to go looking.

When something fails

A repair, checked twice

A repair helper drafts a fix from a cleaned-up copy of the error. A second, separate reviewer reads the fix and adds its verdict. Joseph taps Approve, then Confirm.

Live calls

No fixes mid-call

If a call is in progress, an approved fix waits. It goes in by itself once the call ends.

Before any outside AI

A privacy filter

Personal details and keys get stripped out on our own server before the repair helper sees anything.

measured On the test set it caught 100% of keys and 99.6% of personal details.

One core, many businesses

Every assistant shares one rulebook.

How to talk, how to say numbers, what to do when someone wants a person, how to end a call. Those rules are written once and tested on every assistant. Each business adds a thin layer of its own.

Brasswick PlumbingSam, with its own towns and promise

Kelmore Heating & CoolingAlex, with its own towns and promise

Your businessYour name and your promise

Zeitra LineJoseph's assistant

Trade rulesSafety steps, hazard questions, what counts as an emergency

Your tradeWhichever fits your business

Zeitra Line rulesScreens callers, then books Joseph or takes a message

Shared coreShort turns. Numbers as words. Honest about being an assistant. Pages before speaking when someone wants a person. Real callback times only. A fallback for every tool. A clean ending.

A new business starts from the tested core

Nobody writes your assistant from a blank page. Your layer goes on top of rules that are already working on real lines.

One fix reaches everyone

When a rule in the core gets better, every assistant built on it gets that change on its next update.

See it on a real call.

The demos page plays full calls for a plumbing shop and a heating company.

Play a call