SIP Telephony Integration
Connect directly to Cisco, Avaya, FreePBX, or any SIP trunk. Your AI agent registers as a standard SIP extension with PJSIP.
Everything you need to deploy voice AI
From SIP phone integration to intelligent RAG conversations, VoxNexus handles the complexity.
Local TTS with Kokoro
Run text-to-speech locally with Kokoro TTS for $0/minute. Also supports ElevenLabs, Cartesia, and OpenAI TTS for cloud options.
RAG Knowledge Base
Upload PDFs, docs, and text files. Your agent uses vector embeddings (pgvector) to answer questions about your business.
OpenAI & Claude
GPT-4o, Claude Sonnet, and local LLMs via Ollama
Webhook Actions
Trigger CRM updates, bookings, and API calls
LiveKit Powered
Real-time voice with sub-200ms latency
Self-Hosted
Docker deployment, your data stays private
Up and running in minutes
Three simple steps to deploy your AI voice agent.
Create Your Agent
Configure your AI persona, system prompt, LLM provider, and voice settings.
Connect Your Phone
Add SIP credentials to connect to any VoIP system, PBX, or SIP trunk provider.
Start Taking Calls
Your AI agent answers calls 24/7, handles conversations, and triggers webhooks.
Built for real business use cases
VoxNexus powers AI voice agents across industries.
Customer Service
Handle support calls, answer FAQs, and escalate to humans when needed.
Appointment Scheduling
Book appointments, send confirmations, and manage calendars via webhooks.
Lead Qualification
Qualify inbound leads, capture contact info, and route to sales teams.
After-Hours Support
Provide 24/7 coverage without overnight staff. Handle emergencies intelligently.
Healthcare Intake
Collect patient information, schedule appointments, and triage symptoms.
Restaurant Reservations
Take reservations, answer menu questions, and manage waitlists.
Frequently Asked Questions
Common questions about VoxNexus AI voice agents.
Is VoxNexus free?
Yes, VoxNexus is open source and can be self-hosted on your own hardware for $0/minute. There are also paid plans for managed hosting and enterprise features.
Does VoxNexus support SIP telephony?
Yes, VoxNexus includes a PJSIP bridge for integration with enterprise phone systems including Cisco, Avaya, and FreePBX. It supports standard SIP trunking for inbound and outbound calls.
Can I use local AI models with VoxNexus?
Yes, VoxNexus supports local LLMs via Ollama and local text-to-speech via Kokoro TTS. This enables fully offline, privacy-preserving voice agents.
What programming languages does VoxNexus use?
VoxNexus uses Python for the voice agent backend (with LiveKit Agents SDK) and TypeScript/React for the web dashboard (Next.js 15 App Router).
How do I integrate VoxNexus with my existing phone system?
VoxNexus provides SIP device configuration for each agent. Simply point your PBX or SIP trunk to the VoxNexus SIP server, and calls will be routed to your AI voice agent.
What TTS providers does VoxNexus support?
VoxNexus supports Kokoro TTS (local/free), ElevenLabs, Cartesia, and OpenAI TTS. You can choose based on quality, latency, and cost requirements.