Kamailio
High-performance SIP server for VoIP infrastructure
Kamailio is a mature open-source SIP server capable of handling thousands of call setups per second. It is used to build VoIP, presence, instant messaging, and real-time communication services.
Key features
- High-throughput SIP routing
- Presence and IM support
- Extensive module library
- Carrier-grade scalability
Strengths
- Released under the GPL-2.0 license
- First-class Docker support for quick deployment
- Active community (2.9k GitHub stars)
- Written in C
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