FreeSWITCH

FreeSWITCH is an open-source, software-defined telecom stack used to build and run voice, video, and real-time communications infrastructure on commodity hardware. It is commonly used as a softswitch and media server for SIP-based telephony and can also provide browser-based calling via WebRTC.

Key Features

• SIP signaling and media handling suitable for softswitch and PBX-style deployments
• Native WebRTC capabilities for browser-based real-time communications
• Modular architecture with loadable modules for telephony features and integrations
• Built-in conferencing and real-time media services (including mixing and related functions)
• Common voice features such as call routing, IVR building blocks, call recording, and voicemail support

Use Cases

• Build and operate a SIP softswitch or VoIP application server for carriers and enterprises
• Implement IVR, call routing, and contact-center style call flows
• Provide WebRTC calling to web applications without requiring a separate gateway

Limitations and Considerations

• Configuration and operation can be complex for newcomers due to the breadth of telecom concepts and module options
• Certain advanced capabilities may be available only via commercial modules or enterprise distributions

FreeSWITCH is a mature foundation for telecom and real-time media systems, from embedded devices to large-scale deployments. Its modular design and protocol support make it a flexible core for custom telephony platforms and communication products.