RESOURCES

Everything we have written
about building voice AI.

32 guides covering the platform, the API surface, what an agent can do on a call, and what it takes to run one in production.

THE PLATFORM

What Nixflex is

Start here if you are working out what a voice AI platform does and whether it fits what you are building.

Voice AI PlatformThe platform view: what runs a phone agent end to end.Voice AI InfrastructureThe engine underneath, and why owning it matters.AI Voice AgentsWhat an agent is, and how one template serves many numbers.AI Phone AgentAn agent that answers a real phone line.Conversational AIWhy a conversation beats a press-one menu.Real-Time Voice AIWhat has to happen between a caller speaking and hearing a reply.Voice Agent PlatformThe lifecycle of an agent from build to live.AI Call CenterMany calls at once, without a floor of headsets.Voice AutomationCalls that trigger the rest of your stack.

THE API

Building on the API

The endpoint surface, how calls are dispatched, and what comes back afterwards.

Developer OverviewThe front door: keys, first request, what exists.Voice AI APIEvery endpoint group, auth, and response shapes.Voice AI API, in briefThe short version of what the API does.Voice Agent APIThe agent object and its full lifecycle.Calling APISingle dispatch and batch campaigns.AI Calling APITriggering calls from your own systems.Phone Agent APIBinding an agent to a number, inbound and outbound.Phone Agent API, in briefThe compact reference for number-bound agents.Web Call APIVoice in the browser, with no phone number.SDKs and RESTWhy there is no SDK yet, and why REST is enough.

WHAT AGENTS CAN DO

Agent capabilities

The actions an agent takes on a call, and how it reaches your own systems mid-conversation.

Agent ToolsTransfer, text, wait and end call, with one line of prompt each.Function CallingThe agent calls your API and speaks the answer.WebhooksCall events pushed to your server as they happen.AI ReceptionistAnswer, route, book, take a message.Build a Phone AgentThe path from idea to a live agent, in order.Embed on Your SiteOne script tag puts a voice bubble on your pages.

BUILDING A PRODUCT ON IT

Multi-tenancy and white-label

For teams putting voice inside their own product and serving it to their own customers.

Voice AI for SaaSShip voice as a feature of your product.Multi-Tenant Voice AIProvision and isolate many customers over one API.White-Label Voice AIResell under your brand, with the provider invisible.Bring Your Own CarrierYour Twilio or Telnyx account, your numbers, your rates.

RUNNING IT

Testing and production

What to do before real callers arrive, and how to keep an eye on things once they have.

Testing an AgentA scenario list, awkward test calls, and a fast fix loop.MonitoringVolume, outcomes, sentiment, and listening to a live call.Voice AI in Your AppThe three surfaces voice can arrive through.

STILL THE FASTEST WAY IN

Read less, build something.

Most of what is on this page makes more sense once an agent is answering. Create one, point a number at it, and call it yourself. The quickstart takes about five minutes, and the guides here will still be waiting when you hit something specific.

Start building free Read the quickstart