How does an AI voice agent work?
An AI voice agent has a voice layer and an agent layer. The voice layer listens and speaks: it notices when the person is talking, works out their words and produces speech. The agent layer decides what to do: it follows its instructions, calls tools such as a document search or a calendar, and forms the reply.
OpenAI’s documentation, read on 8 October 2026, describes three ways to build one. A chained pipeline runs speech to text, a text agent and text to speech in turn. A speech-to-speech session uses one model to hear, reason and speak. GPT-Live, which OpenAI suggests for new conversational voice apps, listens and speaks at the same time while a separate backend model handles reasoning and tools.
Example: a support agent hears “How do I invite a colleague?”, searches the help centre, finds the article on team invitations and talks the caller through it, stopping if they interrupt with a follow-up question.
How do you tell a useful voice agent from a risky one?
The word “agent” covers everything from a spoken FAQ to software that changes customer accounts. Five questions tell them apart:
- Where do its answers come from: a knowledge base it searches, or whatever the model already knows?
- What can it do: answer only, or take actions such as refunds and bookings, which need permissions and confirmations?
- How does it take turns: does it wait for the caller to finish, and stop when interrupted?
- Does it say it’s an AI? In the EU, Article 50 of the AI Act requires AI systems that interact directly with people to be designed so they’re told, unless it’s obvious.
- Where does it run: on a phone number, in an app or in a widget on a web page?
How do Kawl Now’s voice agents work?
Kawl Now gives a SaaS website two AI voice agents, one for support and one for sales, each with its own knowledge, instructions, greeting, voice and widget. Visitors talk to them in the browser, and there’s no phone number for customers to call.
Each agent is told to search its channel’s approved knowledge before answering product questions. When nothing there answers, it’s told to say it doesn’t know and point the caller to your usual contact options, or to the Talk to a human button if you’ve turned on handover. It’s also told to say that it’s an AI, and the widget tells callers so before the call starts.
The agents answer questions and, when a caller asks, record a bug report, feature request or other feedback on the conversation. They have no account access and can’t change orders or subscriptions. Calls with an agent stop at 10 minutes.
Human handover is an early release. Your team verifies a UK or US phone number and turns handover on for each agent, and the person who answers hears a private briefing before the caller is connected. Customer routing is still being tested, so keep your usual contact options.
Common questions
Is an AI voice agent the same as an AI receptionist?
No. An AI receptionist is one kind of AI voice agent: it answers a business’s phone line, takes messages and books appointments. Other voice agents work in apps or in a widget on a website, like Kawl Now, which has no phone number for customers to call.
What can an AI voice agent do?
It can answer questions from the information it has, ask clarifying questions and, when it’s connected to tools, look things up or take actions such as booking a meeting. What a particular agent can do depends on the tools and permissions its builder gives it.