FreeSWITCH is a software-defined telecom stack that replaces proprietary telephone switches with a versatile software implementation running on commodity hardware.
FreeSWITCH addresses the need to move telecommunications infrastructure away from expensive proprietary systems toward flexible, software-based alternatives. It implements a complete telecom stack supporting SIP, VoIP, WebRTC, and SMS, enabling devices ranging from Raspberry Pi single-board computers to multi-core servers to function as telecommunications switches. The project is written in C and can be deployed across Linux, Windows, macOS, and BSD platforms. It includes modular components and integrates with SignalWire, a hosted cloud platform operated by the original FreeSWITCH developers, allowing systems to interconnect with external networks and scale beyond single-machine deployments.
FreeSWITCH suits organizations building custom telecommunications infrastructure, IoT applications requiring voice capabilities, or those seeking to reduce dependency on proprietary vendor hardware. It works well for projects needing flexible call routing, media handling, and integration with modern communication protocols. The README recommends building from source on Debian as the primary approach, though it also documents installation paths for Raspberry Pi and CentOS. For those preferring not to manage deployments independently, the README notes that professional services and commercially supported builds are available through SignalWire's core team.
The project maintains an active issue tracker and pull request system on GitHub. Development occurs across multiple platforms with Docker examples provided for building from source. Documentation is centralized in a Confluence wiki with step-by-step tutorials for different deployment scenarios. The codebase includes packaging scripts for creating Debian packages and pre-built installers for Windows, alongside tarball releases for other platforms.
