Using regions in the services

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How to choose

• Latency. Pick the region closest to your callers. Region sets the latency floor for every turn, and a distant region adds hundreds of milliseconds to each round trip.
• Data residency. If a jurisdiction requires your data to stay inside its borders, pick that region instead.

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Text to speech and speech to text

curl https://eu-west.api.slng.ai/v1/tts/slng/fish/tts:s2.1-pro \
  -H "Authorization: Bearer $SLNG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "text": "Hello from sunny Barcelona!",
    "reference_id": "16cabdb7f8d240569aff36c9e480d783"
  }' \
  --output hello.mp3

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Context Router

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Agents

• Dashboard
• API

On the Configure your project step, open the Region dropdown and pick where the project lives. SLNG places the agent in an agent region there.

Set the region field in the create body to an agent region code, for example eu-west (SLNG Managed) or eu-central-livekit (LiveKit Cloud).

curl -X POST https://api.agents.slng.ai/v1/agents \
  -H "Authorization: Bearer $SLNG_API_KEY" \
  -H "Content-Type: application/json" \
  -d @agent.json

agent.json

{
  "name": "Support agent",
  "region": "eu-central-livekit",
  "language": "en",
  "system_prompt": "You are a support agent for Wayne Enterprises.",
  "greeting": "Hi, how can I help you today?",
  "models": {
    "stt": "deepgram/nova:3",
    "llm": "bedrock-mantle/nvidia.nemotron-super-3-120b:latest",
    "tts": "slng/fish/tts:s2.1-pro",
    "tts_voice": "16cabdb7f8d240569aff36c9e480d783"
  }
}

​

Best option

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Next steps

• Create an agent to set a region when creating an agent.
• Regions map for every region and its base URL.
• Agent regions for agent region codes and moving an agent.
• Custom LLM to configure the router in a supported agent integration.
• Context Router for how routing works with your keys or SLNG-hosted models.