Skip to main content
RevRing supports AI voice agents in 20+ languages, enabling you to serve customers globally with natural-sounding voices in their native language.

​
Supported Languages

RevRing offers 300+ voices across the following languages:
  • English (en)
  • Spanish (es)
  • Italian (it)
  • German (de)
  • Portuguese (pt)
  • Turkish (tr)
  • Japanese (ja)
  • Hindi (hi)
  • Dutch (nl)
  • Chinese (zh)
  • Greek (el)
  • Ukrainian (uk)
  • Arabic (ar)
  • Danish (da)
  • Estonian (et)
  • Finnish (fi)
  • Norwegian (nb, no)
  • Swedish (sv)
  • Vietnamese (vi)
Voice Flexibility: Any voice can be used with any language setting. For example, you can use a Spanish-labeled voice on an English-language agent to achieve a Spanish accent, or mix and match voices and languages to create the exact speaking style you need.

​
Setting Agent Language

​
Via Dashboard

  1. Navigate to Agents and select your agent
  2. Go to the Overview tab
  3. Select your desired Language from the dropdown and click Save
  4. Go to the Voice tab
  5. Choose a Voice that matches your selected language
  6. Click Save Voice
You can preview all available voices in the Voice Library.

​
Via API

Set the language when creating or updating an agent: 
curl -X PATCH https://api.revring.ai/v1/agents/agent_123abc \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "language": "es",
    "voiceId": "revring-rafael"
  }'
Supported language codes:
  • en (English)
  • es (Spanish)
  • pt (Portuguese)
  • de (German)
  • it (Italian)
  • nl (Dutch)
  • zh (Chinese)
  • ja (Japanese)
  • hi (Hindi)
  • tr (Turkish)
  • el (Greek)
  • uk (Ukrainian)
  • ar (Arabic)
  • da (Danish)
  • et (Estonian)
  • fi (Finnish)
  • nb (Norwegian Bokmål)
  • no (Norwegian)
  • sv (Swedish)
  • vi (Vietnamese)

​
Writing Prompts for Multilingual Agents

​
Best Practice: Match Prompt Language

For optimal performance, write your agent’s prompt in the same language as the agent’s configured language setting: Spanish Agent Example: 
Eres un asistente de servicio al cliente profesional y amigable.

INSTRUCCIONES:
- Saluda a los clientes calurosamente
- Responde preguntas sobre nuestros productos
- Mantén las respuestas concisas y útiles

Siempre sé cortés y profesional.

​
Cross-Language Prompts

While not required, agents can follow prompts written in a different language than their speaking language. The AI is intelligent enough to understand instructions in one language while conversing in another: English Prompt for Spanish Agent: 
You are a customer service agent speaking Spanish.

INSTRUCTIONS:
- Greet customers warmly in Spanish
- Answer questions about our products
- Keep responses under 30 seconds

Always be polite and professional.
However, for best results and consistency, we recommend writing prompts in the agent’s configured language.

​
Language System Variable

The {{language}} system variable is automatically available in all prompts and contains the agent’s language code: 
You are speaking in {{language}}.

Current language: {{language}}
Timezone: {{timezone}}
Current time: {{current_time}}
This can be useful for building flexible prompts or logging purposes.

​
Voice Selection

Each language has multiple voices to choose from. Visit the Voice Library to preview all available voices in your selected language.

​
English Voice Categories

English offers two categories of voices:
  • English Ultra-Realistic (Beta): Cutting-edge voices with exceptional naturalness and expressiveness
  • English Stable: Reliable, production-ready voices with consistent performance
If you experience instability with Ultra-Realistic voices, try switching to an English Stable voice for better reliability.

​
Troubleshooting

​
Voice Instability

If you notice inconsistent voice quality or unexpected behavior:
  1. Switch Voice Category: For English agents, try switching from Ultra-Realistic to Stable voices
  2. Verify Language Match: Ensure the selected voice matches your agent’s language setting

​
Need Help?

For assistance with multilingual setup, voice selection, or configuration, contact support. Our team can help you:
  • Choose the right voices for your use case
  • Optimize prompts for specific languages
  • Configure multilingual routing strategies
  • Troubleshoot voice quality issues

​
Complete Example

Here’s a complete Spanish agent configuration: Via API: 
curl -X POST https://api.revring.ai/v1/agents \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "sipTrunkId": "trunk_abc123",
    "name": "Asistente en Español",
    "language": "es",
    "voiceId": "revring-rafael",
    "promptTemplate": "Eres un asistente de servicio al cliente. Ayuda al cliente con sus preguntas.",
    "firstMessage": "Hola, bienvenido. ¿Cómo puedo ayudarte hoy?"
  }'
Via Dashboard:
  1. Create agent with name “Asistente en Español”
  2. In Overview tab:
    • Language: Spanish
    • First Message: “Hola, bienvenido. ¿Cómo puedo ayudarte hoy?”
    • Prompt: “Eres un asistente de servicio al cliente. Ayuda al cliente con sus preguntas.”
  3. In Voice tab:
    • Voice: Rafael
For businesses serving multiple language markets, create separate agents for each language rather than trying to make a single agent multilingual. This ensures the best voice quality and conversation experience.