Kamailio (formerly named OpenSER) is a high-performance SIP (RFC3261) server, with a flexible architecture and many extensions. The server implements proxy, registrar, redirect, and location SIP/VoIP services. It has support for UDP/TCP/TLS transport layers, ENUM, AAA via database, RADIUS, DIAMETER, gateways to SMS and XMPP, least cost routing, load balancing, NAT traversal, and call processing language.
| Tags | Communications Telephony |
|---|---|
| Licenses | GPL |
| Operating Systems | POSIX Linux BSD Solaris Unix |
| Implementation | C |
Recent releases


Release Notes: This is a maintenance release including fixes since the release of v3.2.1. Installations running previous 3.x.x versions are advised to upgrade.


Release Notes: This is a maintenance release including fixes since the release of v3.2.0. Installations running previous 3.x.x versions are advised to upgrade.


Release Notes: This is a major release with a large set of new features, such as asynchronous SIP request routing, SDP operations, distributed SIP message queue, JSON support, connectors to REDIS and SQLite databases, partitioned user location service, a SIP traffic capture server, OMA extensions for presence and xcap services, and full CDR storage.


Release Notes: This is a maintenance release of the latest stable branch, 3.1, including fixes since the release of v3.1.4. Installations running previous 3.x.x versions are advised to upgrade to 3.1.5.


Release Notes: This is a maintenance release of the latest stable branch, 3.1, including fixes since the release of v3.1.3. Installations running previous 3.x.x versions are advised to upgrade to 3.1.4.