Overview
This post covers the technical details behind multi-provider telephony: twilio vs exotel vs plivo vs vobiz for indian voice ai. We'll walk through the architecture, trade-offs, and real-world performance data from the Edesy platform.
The Challenge
Most voice AI implementations face trade-offs between quality, latency, cost, and language support. Getting all four right simultaneously — especially for Indian languages — requires careful architectural decisions.
How It Works
Architecture
The Edesy platform supports multiple approaches depending on the use case:
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Native audio-to-audio — Gemini Live 2.5 HD processes speech directly, generating speech output without intermediate text, which keeps responses fast. 30 HD voices across 24 languages.
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Traditional pipeline — STT (Deepgram/Google Chirp/Azure) -> LLM (GPT-4o/Gemini) -> TTS (Google HD/ElevenLabs). More flexible but higher latency (800ms-2s).
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Hybrid approach — Use native audio for supported languages, fall back to pipeline for others.
Performance Data
From production deployments:
- Scale: 3.4 lakh+ connected conversations and 1.8 lakh+ minutes of talk time
- Languages: 75+ supported, including 14 Indian languages
- Cost: INR 4-6 per minute for end-to-end voice AI
Implementation Details
The specific implementation depends on the use case. For Indian language deployments, we typically recommend:
- STT: Google Chirp for best Indian language accuracy
- LLM: Gemini Live 2.5 for native audio, GPT-4o for pipeline
- TTS: Google HD voices for Indian languages, ElevenLabs for premium quality
- Telephony: Exotel or Plivo for Indian numbers, Twilio for international
Real-World Results
Edesy platform data (6,000+ sign-ups, 3.4 lakh+ connected conversations) shows:
- 3.4 lakh+ connected conversations and 1.8 lakh+ minutes of talk time
- INR 4-6 per minute all-inclusive cost
- 24/7 availability for answering calls
Getting Started
Built on Edesy platform data from 3.4 lakh+ connected conversations. Start your free trial.
Related reading
- Exotel AI calling: set up an AI voicebot on your Exotel number
- SIP trunk providers in India for AI calling
- AI voice agent pricing comparison tool — compare per-minute costs across platforms