Voice agent: definition

A voice agent is an AI system that answers or makes phone calls, understands speech, holds a natural conversation, and takes actions like booking or rescheduling, usually handing off to a human when needed.

A voice agent stitches together speech-to-text, a language model for the conversation, and text-to-speech, wired to your calendar or CRM so it can actually do something, not just talk.

The common first win is answering the calls that currently go to voicemail while staff are busy. The rule we never break: anything clinical, legal, or genuinely sensitive is routed to a person with the full transcript.

Related terms

AI agent: An AI agent is a system that uses a language model to decide which steps to take and which tools to call to finish a goal, instead of just answering a single prompt.
Large language model (LLM): A large language model is a neural network trained on huge amounts of text to predict the next token, which lets it write, summarise, classify, and answer questions across almost any topic.
Human in the loop: Human in the loop is a design where an AI system does the work but a person reviews, approves, or handles the cases the system is unsure about, keeping judgement and accountability with a human.