Since the original Elastix website no longer hosts the open-source ISOs, you must turn to community archives and trusted mirrors:
Exceptional driver support for major telephony manufacturers like Digium, Sangoma, and OpenVox. System Requirements elastix 2.5 download
Here are several options for text related to "Elastix 2.5 download," depending on where you intend to use it (e.g., a website download button, a forum post, or a blog article). Since the original Elastix website no longer hosts