> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lyzr.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Building Voice Agents

> Configure engine mode, behavior, knowledge, and advanced voice settings.

# Building Voice Agents

Voice agents use the same role, goal, instructions, tools, knowledge, and guardrail model as text agents, with additional audio and telephony settings.

## Create a voice agent

1. Open **Voice Agents** in Studio.
2. Click **Create Agent**.
3. Choose an engine mode: Realtime or Pipeline.
4. Configure the agent's role, goal, and instructions.
5. Choose who speaks first: the agent or the caller.
6. Optional: connect a Knowledge Base, tools, and dynamic variables.
7. Test the agent before assigning a phone number.

## Engine settings

| Mode     | Configure                                       |
| -------- | ----------------------------------------------- |
| Realtime | Realtime model, voice, instructions             |
| Pipeline | STT provider, LLM provider, TTS provider, voice |

## Advanced options

* Noise cancellation for noisy environments
* Preemptive generation for lower latency
* Call recording for QA and compliance
* Knowledge Base retrieval for grounded answers