Kamailio is an Open Source SIP Server released under GPL, able to handle thousands of call setups per second. Kamailio can be used to build large platforms for VoIP and realtime communications Ð presence, WebRTC, Instant messaging and other applications. It can also easily be applied to scaling up SIP-to-PSTN gateways, PBX systems or media servers like Asterisk, FreeSWITCH or SEMS.
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As of September 2025, the mindshare of Kamailio SIP Server in the Unified Communications category
stands at 10.1%, down from 10.3% compared to the previous year, according to calculations based on PeerSpot user engagement data.
Unified Communications Market Share Distribution
Product
Market Share (%)
Kamailio SIP Server
10.1%
Cisco Unified Communications
12.9%
3CX Live Chat
9.6%
Other
67.4%
Unified Communications
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