Hindi Voice Agents

Hindi (hi-IN) has excellent support across all major providers, making it ideal for voice agents serving the Indian market.

Quick Start#

{
  "agent": {
    "name": "Hindi Support Agent",
    "language": "hi-IN",

    "llmProvider": "gemini-2.5",
    "llmModel": "gemini-2.5-flash-lite",

    "sttProvider": "deepgram",
    "sttModel": "nova-3",

    "ttsProvider": "azure",
    "ttsVoice": "hi-IN-SwaraNeural",

    "greetingMessage": "नमस्ते! मैं आपकी कैसे मदद कर सकता हूँ?",

    "prompt": "आप एक मददगार ग्राहक सेवा एजेंट हैं। हिंदी में जवाब दें।"
  }
}

Provider Options#

STT (Speech-to-Text)#

Recommendation: Deepgram Nova-3 for best accuracy and lowest cost.

TTS (Text-to-Speech)#

Recommendation: Azure Neural voices for best quality Hindi speech.

LLM#

Recommendation: Gemini 2.5 Flash-Lite for best Hindi understanding at lowest cost.

Azure Hindi Voices#

Voice Configuration#

{
  "ttsProvider": "azure",
  "ttsVoice": "hi-IN-SwaraNeural",
  "ttsConfig": {
    "speakingRate": 1.0,
    "pitch": "0%"
  }
}

Hinglish (Hindi-English Mix)#

For agents that handle code-switching between Hindi and English:

{
  "agent": {
    "name": "Hinglish Agent",
    "language": "hi-IN",

    "sttProvider": "deepgram",
    "sttConfig": {
      "language": "hi",
      "model": "nova-3"
    },

    "prompt": "You are a customer support agent. Respond in Hinglish (Hindi-English mix) as commonly spoken in urban India. Example: 'Aapka order ship ho gaya hai, delivery Friday tak expected hai.'"
  }
}

Hinglish Prompt Tips#

## Language Guidelines
- Mix Hindi and English naturally as spoken in urban India
- Use English for technical terms: order, delivery, payment, refund
- Use Hindi for greetings and emotional expressions
- Match the customer's language style

## Examples
Good: "Aapka order successfully place ho gaya hai"
Good: "Main abhi check karta hoon aapka status"
Avoid: Pure formal Hindi that sounds unnatural

Devanagari Script Handling#

Prompt in Hindi#

{
  "prompt": "आप एक सहायक एजेंट हैं। कृपया ग्राहकों की मदद करें।\n\n## नियम\n- विनम्र रहें\n- स्पष्ट उत्तर दें\n- समस्याओं का समाधान करें"
}

Transliteration Support#

Users may type in Roman script:

{
  "prompt": "Users may write Hindi in Roman script (e.g., 'mujhe order status chahiye'). Understand both Devanagari (हिंदी) and Roman transliterations. Always respond in Devanagari script unless the user prefers Roman."
}

Honorifics & Formality#

Hindi has formal (आप) and informal (तुम) address:

{
  "prompt": "## Formality Guidelines\n- Always use 'आप' (respectful you) not 'तुम'\n- Add 'जी' suffix for respect: 'हाँ जी', 'नहीं जी'\n- Use formal greetings: 'नमस्ते', 'नमस्कार'\n- Avoid overly casual language"
}

Formal vs Informal#

Number Handling#

Hindi uses the Indian numbering system:

{
  "prompt": "When speaking numbers, use Indian format:\n- 1,00,000 = एक लाख (not one hundred thousand)\n- 10,00,000 = दस लाख\n- 1,00,00,000 = एक करोड़\n\nSpell out amounts clearly: '₹1,50,000' as 'एक लाख पचास हज़ार रुपये'"
}

Regional Considerations#

Common Hindi Variants#

Greeting by Time#

func getHindiGreeting(hour int) string {
    switch {
    case hour < 12:
        return "सुप्रभात" // Good morning
    case hour < 17:
        return "नमस्कार" // Good afternoon
    default:
        return "शुभ संध्या" // Good evening
    }
}

Complete Example#

Customer Support Agent#

{
  "agent": {
    "name": "Hindi Customer Support",
    "language": "hi-IN",

    "llmProvider": "gemini-2.5",
    "llmModel": "gemini-2.5-flash-lite",
    "llmTemperature": 0.7,

    "sttProvider": "deepgram",
    "sttModel": "nova-3",
    "sttConfig": {
      "language": "hi",
      "keywords": ["ऑर्डर:2", "रिफंड:2", "डिलीवरी:2"]
    },

    "ttsProvider": "azure",
    "ttsVoice": "hi-IN-SwaraNeural",

    "greetingMessage": "नमस्ते! मैं आपकी सहायता के लिए हाज़िर हूँ। आप अपने ऑर्डर के बारे में पूछ सकते हैं, या किसी और विषय पर मदद ले सकते हैं।",

    "prompt": "आप एक ग्राहक सहायता एजेंट हैं।\n\n## आपकी भूमिका\n- ग्राहकों की समस्याओं का समाधान करें\n- विनम्र और सहायक रहें\n- स्पष्ट और संक्षिप्त उत्तर दें\n\n## भाषा\n- शुद्ध हिंदी या Hinglish दोनों चलेगी\n- ग्राहक की भाषा शैली को मैच करें\n- 'आप' का प्रयोग करें, 'तुम' नहीं",

    "allowInterruptions": true
  }
}

Testing Hindi Agents#

Test Phrases#

# Greetings
"नमस्ते"
"हैलो"

# Order queries
"मेरा ऑर्डर कहाँ है?"
"मुझे ऑर्डर स्टेटस चाहिए"
"order number 12345"

# Hinglish
"Mujhe refund chahiye"
"Order kab aayega?"

# Edge cases
"हाँ जी" (short affirmative)
"नहीं नहीं" (repetition)

Common STT Errors#

Cost Optimization#

Budget Configuration#

{
  "sttProvider": "deepgram",
  "ttsProvider": "google",
  "llmProvider": "gemini-2.5"
}

Estimated cost: the base rate only, from ₹4/min (PAYG ₹6/min), + telephony

Quality Configuration#

{
  "sttProvider": "google",
  "sttModel": "chirp_2",
  "ttsProvider": "azure",
  "llmProvider": "gemini"
}

Estimated cost: base rate + ₹2.20/min add-ons (Google STT ₹1.00, Azure TTS ₹1.20), + telephony

Next Steps#

• Tamil - Tamil configuration
• Indian Languages - All Indian languages
• Function Calling - Add tools