Voice infrastructure

Provider-agnostic. Route by quality, cost, and language.

Truffl is not tied to any single voice provider. Swap STT, LLM, TTS, or telephony without rebuilding your workflow.

See how routing works See pricing

Supported providers

Every layer. Any provider.

Configure STT, TTS, LLM, telephony, voice infra, and VAD independently. Mix and match by use case, language, and cost.

Speech-to-Text (STT)

Convert spoken audio to text with low latency and high accuracy.

Deepgram

Default

nova-2 model, best-in-class latency

Sarvam

Indic languages — Hindi, Tamil, Kannada, Telugu, Bengali

Whisper (OpenAI)

Multi-language support, high accuracy

Azure Speech

Enterprise-grade, broad language support

Text-to-Speech (TTS)

Synthesize natural-sounding voice responses.

ElevenLabs

Popular

Most natural voice quality

Cartesia

Ultra-low latency synthesis

Azure Neural TTS

Reliable enterprise option

Google WaveNet

High-fidelity synthesis

Sarvam Bulbul

Hindi-first, Indic language optimized

Language Models (LLM)

Power agent reasoning, objection handling, and response generation.

GPT-4o

Default

OpenAI flagship, best reasoning

GPT-4o-mini

Fast and cost-efficient

Gemini 1.5 Flash

Google low-latency model

Gemini 1.5 Pro

Google high-quality model

Claude Sonnet

Anthropic — strong instruction following

Llama 3

Open-source, self-hostable

Mistral

European open model

Telephony

Route calls through your preferred carrier or SIP provider.

Twilio

Global reach, programmable voice

Plivo

Global, cost-efficient

Exotel

India

India-first, strong local coverage

SIP providers

Bring your own SIP trunk

Voice Infrastructure

Orchestration layers for real-time voice pipeline management.

Vapi

Voice AI orchestration

LiveKit

Real-time audio infrastructure

Pipecat

Open-source voice agent framework

Voice Activity Detection (VAD)

Detect when the caller starts and stops speaking for natural turn-taking.

Silero VAD

Default

Default preset, lightweight and accurate

Deepgram VAD

Best paired with Deepgram STT

Custom presets

Configure silence threshold and sensitivity

Provider routing

Provider-agnostic routing. No vendor lock-in.

Truffl routes across providers dynamically based on use-case quality benchmarks, language requirements, cost targets, and latency constraints. You can swap any layer — STT, LLM, TTS, telephony — without rebuilding your workflow.

Route by language — use Sarvam for Hindi, Deepgram for English
Route by latency — switch to Cartesia TTS for sub-200ms target
Route by cost — prefer GPT-4o-mini for high-volume qualification calls
Fallback chains — automatically retry on provider error

See how routing works in your workflow.

We'll show you exactly which providers your use case needs and why.

Book a deployment walkthrough See pricing

Truffl