Welcome to Asterisk Packaging. Here you can get the latest available Asterisk releases for every supported version of Debian and Ubuntu.
Adding the repository
Import to public key for the Asterisk Packaging Team <firstname.lastname@example.org>.
Add the release branch for the Asterisk packages.
Step 2.1 (Optional)
The proposed updates are updates which are waiting to be moved into the release branch after some testing. They may never reach recommended or they may be replaced with a more recent update. Enabling this is reasonable if you want to participate in testing minor updates, or know that your specific problem has been solved here but the package hasn't reached recommended yet.