Beginning with release 4.1, CDRouter and CDRouter-Multiport will include a specific build number that will be visible in the Advanced > System Information tab within BuddyWeb or via the buddy -system-info command. A build is a specific version of the current release of CDRouter that is installed.
Between releases QA Cafe may provide updated builds that address bugs or functionality identified by customers. In some cases you may be asked by QA Cafe Customer Support to download and install the latest build of CDRouter to address an issue you may be having.