Flexisip is a modular SIP server suite designed for building and operating VoIP communication services. It provides the signalling infrastructure needed to connect SIP users, route calls and support communication between clients and other telephone systems.
It can be deployed as part of a larger communications platform or used to provide services for SIP-compatible clients. Its architecture separates the main server functions into components that can be configured according to deployment requirements.
Flexisip is suitable for Linux servers and embedded systems. Its modular design allows operators to enable the services they need without deploying every component, making it useful for both specialised SIP infrastructure and more comprehensive VoIP installations.
This is free and open source software.
Key Features
- SIP proxy server for routing signalling messages between clients and services.
- Modular architecture with configurable server components.
- SIP registrar functionality for managing client registrations and contact information.
- Presence server providing information about user availability and online status.
- Push notification service for incoming calls and messages on mobile devices.
- Back-to-Back User Agent (B2BUA) for managing calls between separate SIP endpoints.
- Support for SIP trunking and integration with external telephone systems.
- Caller identity translation and media transcoding through B2BUA functionality.
- Registration event server for notifying other domains about user registration changes.
- TLS support for securing SIP signalling connections.
- Redis integration for registration storage and communication between clustered server instances.
- Optional SNMP monitoring support.
- Configuration through a documented server configuration file.
- Deployment options for conventional Linux servers and embedded systems.
- CMake-based build system with support for generating Linux packages.
- Conference server functionality is maintained and packaged separately from the main Flexisip server.
Website: github.com/BelledonneCommunications/flexisip
Support:
Developer: Belledonne Communications
License: GNU Affero General Public License v3.0
Flexisip is written in C++. Learn C++ with our recommended free books and free tutorials.
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Read our verdict in the software roundup.
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