Kamailio - The Open Source SIP Server
Kamailio® (successor of OpenSER and SER) is a robust Open Source SIP Server released under GPLv2+, designed to handle thousands of call setups per second. It is a cornerstone for building large-scale VoIP and real-time communication platforms, supporting applications like presence, WebRTC, instant messaging, and more. Written in pure C for Unix/Linux systems with architecture-specific optimizations, Kamailio offers high performance even on systems with limited resources, making it suitable for both small setups and carrier-grade servers.
Key Features
- High Performance: Capable of managing thousands of call setups per second with asynchronous TCP, UDP, SCTP, and secure TLS communication.
- Versatile Protocols: Supports WebSocket for WebRTC, IPv4/IPv6, SIMPLE instant messaging, presence with embedded XCAP server, and MSRP relay.
- Scalability: Ideal for scaling SIP-to-PSTN gateways, PBX systems, and media servers like Asterisk™, FreeSWITCH™, or SEMS.
- Advanced Routing: Features include ENUM, DID, least cost routing, load balancing, and routing failover.
- Extensive Backend Support: Integrates with MySQL, Postgres, Oracle, Radius, LDAP, Redis, Cassandra, MongoDB, and Memcached.
- IMS and VoLTE: Offers IMS extensions for VoLTE and comprehensive accounting, authentication, and authorization.
- Management and Monitoring: Provides JSON and XMLRPC control interfaces along with SNMP monitoring.
Use Cases
Kamailio is perfect for developers and businesses looking to build or enhance VoIP platforms, SIP load balancers, edge proxies, SBCs, registrars, location services, and instant messaging systems. Its flexibility allows it to power everything from small business communication solutions to large-scale carrier infrastructures.
Unique Selling Points
- Open Source and Collaborative: A community-driven project fostering secure and extensible SIP server development.
- Longevity and Reliability: With over 20 years of continuous development since 2001, Kamailio has a proven track record.
- Award-Winning: Recognized as the Best Open Source Networking Software in 2009, reflecting its industry impact.
Kamailio is an essential tool for anyone in the real-time communications space, offering unmatched flexibility and performance.
