Kamailio project started to create the archive with Debian/Ubuntu packages for each stable release. Practically each version gets its own APT repository, allowing to install any of the archived versions at any time.
More details about archived APT repositories are available at:
Technically, the Debian/Ubuntu packages are generated by the service running at deb.kamailio.org, which still offers the latest stable branch versions and nightly builds, and on each release a snapshot mirror is created for that version. The corresponding repository reflects the version number in the APT URL, for example for kamailio v5.5.2, the archive repository URL is:
This repository will still be available after v5.5.3 is released, therefore people that upgrade to v5.5.3 but then want to downgrade to v5.5.2 can do it by setting the corresponding URL in the APT configuration file.
At this moment, archived versions are 5.3.8, 5.4.6, 5.4.7, 5.5.1, 5.5.2 – the list of these repository can be seen at:
Thanks for flying Kamailio!