SHEET 01Voice Integrations, Your Complete StackOPEN 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.

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Twilio
Deepgram
OpenAI
ElevenLabs
Azure

6Telephony providers

11Speech engines, ASR and TTS

7Language models

6Workflow connectors

SHEET 02Telephony ProvidersTEL-01..06

Global and regional carrier connectivity

Connect to any telephony platform. Global reach, local optimization, or bring your own carrier.

TEL-01Connected

Twilio

Global coverage, programmable voice, and SMS integration for enterprise-scale voice applications.

TEL-02Connected

Plivo

Cost-effective, API-first voice and messaging platform with multi-country reach.

TEL-03Connected

Exotel

India-optimized telephony with local number support and advanced call analytics.

TEL-04Connected

SIP Trunking

Bring your existing carrier. Direct SIP integration for maximum flexibility.

TEL-05Connected

Vobiz

Regional Indian carrier with local compliance and carrier-grade reliability.

TEL-06Connected

Custom Carrier

Integrate any telephony provider via SIP or API endpoints for complete control.

SHEET 03Speech-to-Text, ASRASR-01..05

Accurate transcription in real time

Choose the ASR engine that balances accuracy, latency, and cost for your use case.

ASR-01Calibrated

Deepgram

Fastest transcription, best accuracy, and lowest latency for real-time voice conversations.

ASR-02Calibrated

Azure Speech Services

Enterprise-grade speech recognition with multilingual support and custom vocabulary.

ASR-03Calibrated

OpenAI Whisper

Open-source speech-to-text model. Self-host for maximum data control.

ASR-04Calibrated

Google Speech-to-Text

Wide language support, noise robustness, and automatic punctuation.

ASR-05Calibrated

Custom ASR

Bring your own speech recognition model via API for domain-specific accuracy.

SHEET 04Large Language ModelsLLM-01..07

The intelligence layer for your voice agent

Route to the best model for reasoning, safety, compliance, or cost. Switch per call without code changes.

LLM-01Routable

OpenAI GPT-4 & GPT-4o

Best reasoning, multimodal understanding, and structured output for complex agent logic.

LLM-02Routable

Anthropic Claude

Safety-focused, constitution-aligned reasoning with strong conversation skills.

LLM-03Routable

Azure OpenAI

Enterprise compliance, data residency, and private endpoints for regulated industries.

LLM-04Routable

Google Gemini

Multimodal capabilities, high throughput, and competitive latency for real-time agents.

LLM-05Routable

DeepSeek

Cost-effective alternative with strong reasoning capabilities and flexible licensing.

LLM-06Routable

Self-Hosted LLM

Run Llama, Mistral, or other open models on your infrastructure for full data control.

LLM-07Routable

OpenRouter

Route between multiple models, compare outputs, and optimize cost per request.

SHEET 05Text-to-Speech, TTSTTS-01..06

Natural-sounding voice synthesis

Choose from the most natural voices available. Ultra-low latency for real-time conversation quality.

TTS-01Streaming

ElevenLabs

Most natural-sounding voices with ultra-low latency streaming for real-time conversations.

TTS-02Streaming

Cartesia

Ultra-low latency text-to-speech built for voice AI with instant, smooth voice synthesis.

TTS-03Streaming

Azure Speech Services

Enterprise TTS with 400+ voices across 100+ languages and custom neural voices.

TTS-04Streaming

OpenAI TTS

Simple, reliable text-to-speech with preset voice options and high-quality audio.

TTS-05Streaming

Rime

Custom voice cloning and ultra-low latency synthesis for branded agent voices.

TTS-06Streaming

Custom TTS

Integrate any text-to-speech provider via API for specialized use cases.

SHEET 06Workflow and External ToolsWRK-01..06

Connect to your business systems

Trigger workflows, update CRMs, book appointments, and call any API. Agents execute across your entire stack.

WRK-01Triggerable

Zapier

5000+ app connections. Trigger workflows in Slack, email, CRM, and analytics platforms.

WRK-02Triggerable

Make.com

Visual workflow builder with advanced logic, conditional branching, and data transformation.

WRK-03Triggerable

n8n

Open-source workflow automation. Self-host for full privacy and integration control.

WRK-04Triggerable

Cal.com

Appointment and meeting booking. Agents can check availability and schedule directly.

WRK-05Triggerable

CRM Systems

Salesforce, HubSpot, Pipedrive, and custom CRM APIs. Update records during calls.

WRK-06Triggerable

Custom API

Call any REST endpoint during the conversation. Query databases, trigger webhooks, and more.

SHEET 07Flexible Model RoutingPER CALL

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.

One pipeline, four interchangeable stages. The router picks each provider at call time, so a single agent can favor accuracy on one call and cost on the next.

SHEET 08Get StartedREADY

Build your voice AI stack today

Connect to your preferred providers and deploy voice agents in minutes. No lock-in, no limits on integrations.

Schedule Integration Demo See How It Works

Surface: Voice AI · Integrations
Stack: Telephony · ASR · LLM · TTS · Workflow
Coverage: 30+ providers · ∞ custom APIs
Lock-in: None · swap any layer per call
Sheet: 8 of 8 · Voice AI

Start with your stack

Use the telephony, ASR, LLM, and TTS providers you already trust or prefer. assistents works with all of them.

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Scale without switching

As your needs grow, add providers and workflows without migrating agents or retraining models.

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