version 5.5.6 maintenance release of the stable branch 5.5 that includes fixes since the release of v5.5.5. There is no change to database schema or configuration language structure that you have to do on previous installations of v5.5.x. Deployments running previous v5.5.x versions are strongly recommended to be upgraded to v5.5.6. Note that 5.5 is the second last stable branch, still officially maintained by Kamailio development team. The latest stable branch is 5.6, with v5.6.4 being release out of it. For more details about version 5.5.6 (including links and guidelines to download the tarball or from GIT repository), visit: * https://www.kamailio.org/w/2023/03/kamailio-v5-5-6-released/