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NixflexDevelopersAI Receptionist API
Developers · AI receptionist API

A front desk that never misses a call

Build an AI receptionist that answers every call the moment it rings, greets the caller, routes them to the right person, books appointments in real time, and takes a message when that is the right thing to do. Every call ends with a summary in your systems. Flat $0.08 a minute.

Incoming call…ring
Route the call→ Sales, warm transfer
Book an appointment→ Thu 2pm, confirmed
Take a message→ Summary sent to you
Transcript · summary · sentiment, back to your systems

A receptionist, not a voicemail

An answering service is reactive; it takes a message and hands it to you later. A receptionist is proactive. It resolves the call while the caller is still on the line, answering the question, routing to the right person, or booking the appointment, and only takes a message when that genuinely is the best outcome. Callers get help at the moment they reach out, which is the difference between a captured customer and a missed one.

The four things it handles

Answer

Pick up instantly on every call, day or night, across as many lines as ring at once. Nothing goes to voicemail during business hours.

Route

Understand who the caller needs and transfer them, cold or warm, with a summary so they never repeat themselves.

Book

Check live calendar availability and confirm an appointment inside the call, then text a confirmation.

Message

When a message is the right outcome, capture exactly the details you specified and send them to you as a summary.

Built on the same agent and tools

A receptionist is not a separate product; it is an agent with the right prompt and the right tools. Give it a calendar and it books, register your API and it looks things up, and it routes and transfers out of the box. Because it is an agent template, one receptionist can cover a different number for every branch or client, each isolated, all from one API key.

You see every call, not just the missed ones

Whatever the outcome, each call returns a transcript, a summary and a sentiment score, pushed to your webhook or read from GET /v1/calls. You know who called, what they wanted, and what happened next, without listening back. There is no SDK to install first; the API is plain REST you call from any language.

See the Build a phone agent, Function calling and Multi-tenant pages, or the full docs. Coming from another platform? Nixflex is a modern alternative to Retell, Vapi and Bland. Compare them →

Developer FAQ

What can an AI receptionist actually do?

It answers every call instantly, greets the caller in your brand voice, answers common questions, routes the call to the right person, books appointments in real time, and takes a detailed message when needed. Each call ends with a summary sent back to you, so nothing is lost and no caller waits on hold.

How is this different from an answering service?

An answering service is reactive: it takes a message for later. A receptionist is proactive. It resolves the call in the moment, routing, booking or answering, and only takes a message when that is the right outcome. Callers get an answer when they reach out rather than leaving one behind.

Can it route calls to the right person?

Yes. It understands who the caller wants and transfers them, cold or warm, to the right person or department, with a summary so the caller does not have to repeat themselves. It routes on intent rather than a press-one menu.

Does it really book appointments during the call?

Yes. Connect a calendar and the receptionist checks live availability and confirms a slot inside the conversation, then can send a confirmation by SMS. The time and reference are supplied by the engine, not guessed, so what it confirms is real.

What happens when it takes a message?

It captures the details you told it to collect and sends them to you as a summary, by webhook or readable from GET /v1/calls, along with the transcript and a sentiment score. You decide what to capture; the receptionist gathers exactly that.

Can one receptionist cover many locations?

Yes. A receptionist is an agent template, so one configuration can sit behind a separate number for every branch or client, each isolated. You build the front desk once and reuse it, which is how a single agent covers hundreds of numbers.

What does it cost to run a receptionist?

A flat $0.08 per minute of voice, pay-as-you-go, premium model included, with your own carrier underneath. It answers many calls at once with no overtime or after-hours surcharge, so cost scales with minutes rather than headcount.

Build your AI receptionist today

Answer every call, route, book, and never send a customer to voicemail again.