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About Kamailio (OpenSER) SIP Server project

Kamailio is an Open Source SIP Server released under GPL, able to handle thousands of call setups per second. Among features: asynchronous TCP, UDP and SCTP, secure communication via TLS for VoIP (voice, video), SIMPLE instant messaging and pressence, ENUM, least cost routing, load balancing, routing fail-over, accounting, authentication and authorization against MySQL, Postgres, Oracle, Radius, LDAP, XMLRPC control interface, SNMP monitoring. It can be used to build large VoIP servicing platforms or to scale up SIP-to-PSTN gateways, PBX systems or media servers like Asterisk™, FreeSWITCH™ or SEMS. The application is written in C for Linux/Unix platforms and focuses on performance, flexibility and security. In addition to C, extensions can be written in Lua, Perl or Python.

On the 28th of July, 2008, due to trademark issues related to OPENSER word, the OpenSER project changed the name in KAMAILIO. The wiki page for the old project name is still available at: OpenSER.

On Nov 04, 2008, Kamailio and SIP Express Router have started the SIP Router Project.

Latest version: Kamailio v4.2.0 (Oct 16, 2014) - see http://www.kamailio.org/w/

Kamailio World Conference

A dedicated event to Kamailio SIP Server and related project.

Social media

Blog feeds

    Kamailio Headlines








    Release Series

    • 4.2.x
      • 4.2.0 - Oct 16, 2014


    Binary packages for several distributions can be found at:


    • SIP proxy/registrar/redirect server (RFC3261, RFC3263)
    • SIP over UDP
      • MTU fallback support
    • SIP over TCP
      • asynchronous TCP
    • SIP over TLS
      • asynchronous TLS
    • SIP over SCTP
      • multi-streaming
      • multi-homing
    • IPv4 and IPv6
      • multi-homing support
    • Transactional stateful proxy
    • Modular architecture
    • Programmable configuration file
    • ENUM support
    • Call Processing Language (CPL)
    • Gateway to sms or xmpp
    • Authentication, authorization and accounting via Radius or database
    • NAT traversal system
    • Kernel space packet relaying for RTP
    • Least cost routing
    • Load balancing
    • Carrier routing
    • Multiple database backends: MySQL, Postgres, Unixodbc, Oracle, BDB or flat files
    • SIMPLE Presence Server (IETF SIMPLE extensions - rich presence)
    • Dialog Info Presence - SLA/BLA
    • XCAP and RLS
      • embedded XCAP server
    • Presence User Agent
    • Dialog Stateful Proxy
    • Instant Messaging
      • Offline message storage
      • Instant messaging conferencing
    • SNMP support
    • RADIUS support
    • LDAP support
    • Perl Programming Interface
    • Lua Programming Interface
    • Python Programming Interface
    • Java SIP Servlet Application server
    • Number portability
    • XMLRPC control interface
    • Topology hiding
    • Memcached connector
    • Command line interface (cli named sercmd)
    • Support for IMS platforms
    • Support for SIP and MSRP over WebSockets
    • Over 150 modules (extensions)


    Modules Documentation


    Project Resources

    Deploying Kamailio

    Kamailio Installation Guides

    Kamailio and Asterisk

    Kamailio and NAT

    Kamailio and RADIUS

    Kamailio and Web Interfaces


    Kamailio is known to work on
    • most of Linux flavours (OS used for development is mainly Debian)
    • 64b Linux flavours
    • Embedded linux systems
      • Raspberry PI RPMs available
    • SUN/Solaris
    • FreeBSD
    • OpenBSD
    • NetBSD

    Misc Resources

    See also

    Created by: admin, Last modification: Fri 17 of Oct, 2014 (07:01 UTC) by oej
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