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LiveKit’s agent framework lets you build real-time, programmable voice agents. Telnyx integrates with LiveKit through the OpenAI plugin for LLM inference and through livekit-plugins-telnyx for native STT and TTS.

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Voice assistant example

This example is based on LiveKit’s agents examples repo, modified to use Telnyx for LLM inference.

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Set up and activate a virtual env

python -m venv venv
source venv/bin/activate

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Install requirements

pip install -r requirements.txt
pip install livekit-plugins-telnyx

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Download files

This downloads model weights for voice-activity detection: 
python agent.py download-files

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Agent code

The following code uses Telnyx for LLM inference via openai.LLM.with_telnyx(), with Telnyx STT and TTS. 
from dotenv import load_dotenv
from livekit.agents import AutoSubscribe, JobContext, WorkerOptions, cli, voice, llm
from livekit.plugins import openai, silero, telnyx

load_dotenv()


async def entrypoint(ctx: JobContext):
    initial_ctx = llm.ChatContext().append(
        role="system",
        text=(
            "You are a helpful voice assistant powered by Telnyx. "
            "Keep responses short and conversational."
        ),
    )

    await ctx.connect(auto_subscribe=AutoSubscribe.AUDIO_ONLY)

    session = voice.AgentSession(
        llm=openai.LLM.with_telnyx(
            model="meta-llama/Meta-Llama-3.1-70B-Instruct",
        ),
        vad=silero.VAD.load(),
        stt=telnyx.STT(),
        tts=telnyx.TTS(voice="Telnyx.NaturalHD.astra"),
        chat_ctx=initial_ctx,
    )
    session.start(ctx.room)

    await session.say("Hey, how can I help you today?", allow_interruptions=True)


if __name__ == "__main__":
    cli.run_app(WorkerOptions(entrypoint_fnc=entrypoint))

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Set environment variables

export TELNYX_API_KEY=<your Telnyx API key>
export LIVEKIT_URL=<your LiveKit server URL>
export LIVEKIT_API_KEY=<your LiveKit API key>
export LIVEKIT_API_SECRET=<your LiveKit API secret>

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Run the agent worker

python agent.py dev

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Test with a LiveKit frontend

Use the LiveKit Agents Playground to test your agent without building a frontend.

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Telnyx STT & TTS plugin

The livekit-plugins-telnyx package provides native Telnyx STT and TTS plugins for LiveKit agents. 
pip install livekit-plugins-telnyx

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STT

Use telnyx.STT() for real-time speech-to-text via Telnyx’s WebSocket streaming API: 
from livekit.plugins import telnyx

session = voice.AgentSession(
    stt=telnyx.STT(),
    # ... other plugins
)

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TTS

Use telnyx.TTS() for real-time text-to-speech. Pass a voice parameter to select a specific voice: 
from livekit.plugins import telnyx

session = voice.AgentSession(
    tts=telnyx.TTS(voice="Telnyx.NaturalHD.astra"),
    # ... other plugins
)
See TTS available voices for the full list of voice options.