Flexisip

Self-Hosted

Open-source SIP server for real-time voice, video, and IM

Overview

Flexisip is a modular, scalable SIP server enabling secure real-time communication (voice, video, instant messaging, presence). It supports NAT traversal (STUN/TURN), end-to-end encryption (TLS/SRTP), call routing, and integration with legacy telephony systems. Deployable via Docker, pre-built Linux packages, or source code, it caters to small businesses and enterprises needing self-hosted, privacy-focused communication infrastructure. Maintained by Belledonne Communications, it offers flexible customization for specific use cases.

Self-Hosting Resources

Find Official Image on Docker Hub View Source & Docs

Below is a reference structure for docker-compose.yml. ⚠️ Do NOT run blindly. Replace placeholders with official values.

docker-compose.template.yml TEMPLATE


version: '3'
services:
  flexisip:
    image: <OFFICIAL_IMAGE_NAME>:latest
    container_name: flexisip
    ports:
      - "8080:<APP_INTERNAL_PORT>"
    volumes:
      - ./data:/app/data
    restart: unless-stopped

Key Features

Modular design for voice, video, and instant messaging
End-to-end encryption (TLS, SRTP) for secure comms
NAT traversal support via STUN/TURN servers
Scalable for small teams to enterprise deployments

Frequently Asked Questions

? Is Flexisip hard to install?

Flexisip requires basic server admin skills. It can be deployed via Docker (simpler) or pre-built Linux packages. Advanced configurations (encryption, NAT traversal) need familiarity with SIP protocols and network settings.

? Is Flexisip a good alternative to proprietary SIP servers like CUCM?

Yes—Flexisip offers core features (voice/video/IM) for free with self-hosting benefits. While it lacks some enterprise-grade management tools of CUCM, its modular design allows customization for specific needs.

? Is Flexisip completely free?

Yes—Flexisip is open-source under AGPLv3, so it’s free to use, modify, and distribute. Costs may only apply to server hardware or cloud hosting for deployment.

Top Alternatives

Cisco Unified Communications Manager (CUCM) Search Google

Avaya Aura Communication Manager Search Google

Tool Info

Pricing Open Source

Category Communication - SIP

Platform Self-Hosted

Pros

⊕ Free and open-source (customizable under AGPLv3)
⊕ Privacy-focused self-hosted solution
⊕ Supports multiple real-time communication types

Cons

⊖ Requires technical knowledge for setup and configuration
⊖ Limited graphical admin interface (mostly CLI/config files)
⊖ May need additional components (STUN/TURN) for full functionality