Voice Agent Builder
===================

The Voice Agent Builder is the environment for creating phone-based AI agents that handle inbound and outbound calls.

.. image:: ../images/voice-agent-overview.png
   :alt: Voice Agent Builder — overview
   :align: center
   :width: 100%

| A Voice Agent uses speech-to-text (STT) to transcribe what a caller says, passes the transcript to a language model (LLM) for reasoning, and speaks the response back using text-to-speech (TTS) — all in real time over a telephony connection.

Use Voice Agent when you need:

* **Phone-based interactions** — the agent must receive or place calls via a phone number.
* **Real-time speech processing** — conversations happen over voice, not text.
* **Outbound campaigns** — the agent places calls to a list of contacts on a defined schedule.
* **Inbound call handling** — the agent answers incoming calls and routes or resolves them autonomously.

For text-based chat agents, use the :doc:`Chatbot Builder </8_chatbot_builder/index>` instead. For multi-step reasoning workflows over APIs and data sources, use the :doc:`Agentic Flow Builder </9_agentic_flow_builder/index>`.

.. toctree::
   :hidden:

   the_editor
   building_blocks
   testing
   publishing
   agent_settings