Kamailio

Summary

Kamailio is an open-source SIP server that has been in continuous development since 2001. It's a modular implementation of a SIP Signaling Server that can handle thousands of call setups per second, making it suitable for large-scale deployments, such as IP telephony operators or carriers. Kamailio offers a wide range of features, including SIP load balancer, IP telephony engine, least cost routing, SIP firewall, edge proxy, SBC, registrar and location service, instant messaging and presence, MSRP, WebRTC, IPv4-IPv6, IMS, and VoLTE. Its flexibility, robustness, strong security, and extensive features make it an attractive choice for building large platforms for VoIP and real-time communications.

Main Features

Kamailio's key features include:

• SIP Load Balancer: distributes SIP traffic across multiple servers to improve scalability and reliability
• IP Telephony Engine: enables the handling of IP telephony calls, including registration, authentication, and routing
• Least Cost Routing: optimizes call routing based on cost factors such as network latency, cost per minute, and more
• SIP Firewall: provides network-level security by blocking or allowing specific SIP traffic based on predefined rules
• Edge Proxy: enables caching of frequently accessed resources, reducing the load on upstream servers
• SBC (Session Border Controller): manages SIP sessions and ensures interoperability between different networks and devices
• Registrar and Location Service: handles user registration, authentication, and location updates for presence and instant messaging applications
• Instant Messaging and Presence: supports instant messaging and presence services, including XMPP and MSRP
• WebRTC: enables Web-based real-time communications, such as voice and video conferencing
• IPv4-IPv6: supports both IPv4 and IPv6 address families for seamless communication across different networks
• IMS (IP Multimedia Subsystem): provides support for IP multimedia services, including VoLTE (Voice over LTE) and other real-time communication applications

Overall, Kamailio is a powerful open-source SIP server that offers a wide range of features and capabilities, making it an attractive choice for building large-scale platforms for VoIP, instant messaging, presence, and other real-time communications applications.