For every other scenario—from home labs to small business phone systems—skip the nostalgia and install or FreePBX . You will get the same workflow, modern security updates, and a web interface that honors the Elastix legacy without the nightmare of unpatched vulnerabilities.
As the project transitioned in 2016 following its acquisition by 3CX, these original ISOs are now considered legacy software and are primarily hosted on community mirrors: Elastix 3.0 Iso Download