Bolna

Bolna builds voice AI agents for businesses handling support, sales and recruitment calls. It focuses on Indian languages and accents, including Hindi, Hinglish, Tamil and Telugu, alongside English.

• Inbound and outbound calls: Agents answer customer questions, qualify leads and deliver reminders, with support for interruptions and transfers to human agents.
• Speech and model choice: You can combine transcription, language models and speech synthesis from providers such as Deepgram, OpenAI, DeepSeek, ElevenLabs and Cartesia; the core also supports models served through vLLM.
• Actions during calls: Agents can call external APIs during a conversation to retrieve information or trigger business actions.
• Hosted campaigns and workflows: The hosted offering provides a no-code agent builder, bulk calling campaigns and connections to n8n, Make.com and Zapier.

The Python orchestration core is open source under MIT and can run on your own server with Docker. Bolna's hosted APIs and dashboard are separate, closed source services.

Self-hosting the core doesn't make phone calls fully offline. Telephony uses Twilio or Plivo, and any connected cloud speech or model provider receives the audio or text it processes. The core also supports a self-hosted transcription provider using the OpenAI Realtime transcription protocol.