Build an Odia voice agent on Bolna

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Choose an Odia transcriber

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Choose an Odia voice

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Write the prompt for Odia

• Write in Odia script, not romanized Odia. ନମସ୍କାର! ଆପଣ କେମିତି ଅଛନ୍ତି? rather than Namaskar! Apana kemiti achhanti?. Native script gives more accurate pronunciation and stops the text being treated as English.
• Keep common English loanwords in Latin script. Callers say “order”, “OTP” and “support ticket” in English, so keep those words as they are inside Odia script text instead of forcing a pure Odia translation.
• Set gender and politeness explicitly. These are often carried by verb forms, so name the forms you want for the agent’s persona rather than writing “be polite”.
• Read alphanumerics character by character, in English. For OTPs, registration numbers and order IDs, this avoids misheard and mispronounced digits.
• Leave language switching out of the prompt. Bolna switches languages itself.

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Create an Odia agent over the API

{
  "agent_config": {
    "agent_name": "Odia Support Agent",
    "agent_welcome_message": "ନମସ୍କାର! ମୁଁ ଆପଣଙ୍କୁ କିପରି ସାହାଯ୍ୟ କରିପାରିବି?",
    "tasks": [{
      "task_type": "conversation",
      "toolchain": { "execution": "sequential", "pipelines": [["transcriber", "llm", "synthesizer"]] },
      "tools_config": {
        "llm_agent": {
          "agent_type": "simple_llm_agent",
          "agent_flow_type": "streaming",
          "llm_config": { "provider": "openai", "model": "gpt-4.1-mini", "max_tokens": 150, "temperature": 0.2 }
        },
        "transcriber": {
          "provider": "sarvam",
          "model": "saaras:v4",
          "language": "od",
          "stream": true,
          "endpointing": 500,
          "keywords": "Bolna, PhonePe, Flipkart",
          "context": "Inbound support line for an electronics retailer in India. Callers ask about order status and returns, and often read out order numbers."
        },
        "synthesizer": {
          "provider": "sarvam",
          "provider_config": {
            "voice": "Priya",
            "voice_id": "priya",
            "model": "bulbul:v3",
            "language": "od",
            "speed": 1.0
          },
          "stream": true,
          "buffer_size": 150
        },
        "input": { "provider": "plivo", "format": "wav" },
        "output": { "provider": "plivo", "format": "wav" }
      },
      "task_config": { "call_terminate": 90, "hangup_after_silence": 10 }
    }]
  },
  "agent_prompts": {
    "task_1": {
      "system_prompt": "ଆପଣ ଜଣେ ସହାୟକ ସପୋର୍ଟ ଏଜେଣ୍ଟ। ସଂକ୍ଷେପରେ ଉତ୍ତର ଦିଅନ୍ତୁ।"
    }
  }
}

curl https://api.bolna.ai/v2/agent \
  -H "Authorization: Bearer $BOLNA_API_KEY" \
  -H "Content-Type: application/json" \
  -d @agent.json

import os, urllib.request, json

with open("agent.json") as f:
    body = json.load(f)

req = urllib.request.Request(
    "https://api.bolna.ai/v2/agent",
    data=json.dumps(body).encode(),
    headers={"Authorization": f"Bearer {os.environ['BOLNA_API_KEY']}",
             "Content-Type": "application/json"},
)
print(json.load(urllib.request.urlopen(req)))

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Improve recognition with keywords and context

• keywords: a comma-separated list of terms callers say.
• context: a sentence or two describing the call.

• Sarvam: keywords on Sarvam needs saaras:v4, and takes up to 50 terms of up to 64 characters each. context works on every Saaras model.

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Serve Odia and English on one agent

• Code-mixing within a sentence. Sarvam handles switching between English and an Indian language inside a single sentence. A sentence with a few English words is still treated as Odia.
• A full language switch. Add both English and Odia to one agent with multilingual_config, each with its own transcriber, voice and prompt. Odia is not in the automatic detection list, so don’t rely on a mid-call switch into Odia. Start Odia callers in Odia instead, as below. The multilingual quickstart shows the API shape.

• Start a call in Odia with "agent_data": { "language": "od" } on POST /call, or an agent_language column set to od in a batch CSV. Inbound calls can return agent_language from your caller data source.
• Let system messages such as the hangup and “are you still there?” checks follow the active language.
• Read How language switching works for what does and doesn’t trigger a switch.

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Notes

• Bolna’s code for Odia is od, on the transcriber, on Sarvam’s voice and in multilingual_config. Maya is the exception: its provider_config.language takes or.
• On Sarvam, use bulbul:v3 for Odia. bulbul:v4-flash has no Odia voices.
• Odia is not one of the languages Bolna detects automatically mid-call. Start Odia callers in Odia, or make Odia the agent’s default language.
• Sarvam is the only transcriber whose page lists Odia. The Cartesia page notes that Odia is not yet selectable in Bolna on sonic-3.6.

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Phone numbers for Odia agents in India

• Buy an Indian number in the dashboard through Plivo or Vobiz.
• For commercial or telemarketing calls in India, read How to get 140 & 160-series phone numbers in India for the TRAI and DLT requirements.
• To use numbers from your own carrier, connect it with a SIP trunk.

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Next steps