Twilio
Global coverage, programmable voice, and SMS integration for enterprise-scale voice applications.
.// Voice Integrations Your Complete Stack
Bring your own models, telephony, and tools.
assistents integrates with leading telephony providers, speech-to-text engines, large language models, text-to-speech voices, and workflow automation platforms. Mix and match to build the exact voice stack your business needs.
- Twilio
- Deepgram
- OpenAI
- ElevenLabs
- Azure
.// Telephony Providers
Global and regional carrier connectivity
Connect to any telephony platform. Global reach, local optimization, or bring your own carrier.
Plivo
Cost-effective, API-first voice and messaging platform with multi-country reach.
Exotel
India-optimized telephony with local number support and advanced call analytics.
SIP Trunking
Bring your existing carrier. Direct SIP integration for maximum flexibility.
Vobiz
Regional Indian carrier with local compliance and carrier-grade reliability.
Custom Carrier
Integrate any telephony provider via SIP or API endpoints for complete control.
.// Speech-to-Text (ASR)
Accurate transcription in real time
Choose the ASR engine that balances accuracy, latency, and cost for your use case.
Deepgram
Fastest transcription, best accuracy, and lowest latency for real-time voice conversations.
Azure Speech Services
Enterprise-grade speech recognition with multilingual support and custom vocabulary.
OpenAI Whisper
Open-source speech-to-text model. Self-host for maximum data control.
Google Speech-to-Text
Wide language support, noise robustness, and automatic punctuation.
Custom ASR
Bring your own speech recognition model via API for domain-specific accuracy.
.// Large Language Models
The intelligence layer for your voice agent
Route to the best model for reasoning, safety, compliance, or cost. Switch per call without code changes.
OpenAI GPT-4 & GPT-4o
Best reasoning, multimodal understanding, and structured output for complex agent logic.
Anthropic Claude
Safety-focused, constitution-aligned reasoning with strong conversation skills.
Azure OpenAI
Enterprise compliance, data residency, and private endpoints for regulated industries.
Google Gemini
Multimodal capabilities, high throughput, and competitive latency for real-time agents.
DeepSeek
Cost-effective alternative with strong reasoning capabilities and flexible licensing.
Self-Hosted LLM
Run Llama, Mistral, or other open models on your infrastructure for full data control.
OpenRouter
Route between multiple models, compare outputs, and optimize cost per request.
.// Text-to-Speech (TTS)
Natural-sounding voice synthesis
Choose from the most natural voices available. Ultra-low latency for real-time conversation quality.
ElevenLabs
Most natural-sounding voices with ultra-low latency streaming for real-time conversations.
Cartesia
Ultra-low latency text-to-speech built for voice AI with instant, smooth voice synthesis.
Azure Speech Services
Enterprise TTS with 400+ voices across 100+ languages and custom neural voices.
OpenAI TTS
Simple, reliable text-to-speech with preset voice options and high-quality audio.
Rime
Custom voice cloning and ultra-low latency synthesis for branded agent voices.
Custom TTS
Integrate any text-to-speech provider via API for specialized use cases.
.// Workflow & External Tools
Connect to your business systems
Trigger workflows, update CRMs, book appointments, and call any API. Agents execute across your entire stack.
Zapier
5000+ app connections. Trigger workflows in Slack, email, CRM, and analytics platforms.
Make.com
Visual workflow builder with advanced logic, conditional branching, and data transformation.
n8n
Open-source workflow automation. Self-host for full privacy and integration control.
Cal.com
Appointment and meeting booking. Agents can check availability and schedule directly.
CRM Systems
Salesforce, HubSpot, Pipedrive, and custom CRM APIs. Update records during calls.
Custom API
Call any REST endpoint during the conversation. Query databases, trigger webhooks, and more.
.// Flexible Model Routing
Run each call with the best model for the job
Switch ASR, LLM, or TTS per agent or per call without code changes. Optimize for accuracy, latency, or cost on every conversation.
.// Get Started
Build your voice AI stack today
Connect to your preferred providers and deploy voice agents in minutes. No lock-in, no limits on integrations.
Start with your stack
Use the telephony, ASR, LLM, and TTS providers you already trust or prefer. assistents works with all of them.
Request a demoScale without switching
As your needs grow, add providers and workflows without migrating agents or retraining models.
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