Security is a valid concern with older software. Here is an honest assessment:
For most users, downloading the current Zoiper 5 from the official site is the safer choice.
Zoiper 3.15 includes several audio codecs to balance voice quality and bandwidth usage, including: zoiper-free-3.15-setup.exe
Running the setup file reveals a very traditional Windows installation process.
zoiper-free-3.15-setup.exe is a legitimate but outdated VoIP softphone installer. It remains functional for basic SIP calling on older Windows systems, but its age introduces security and compatibility risks. For production use or modern Windows environments, do not install version 3.15 — obtain the current release directly from Securax LTD. Security is a valid concern with older software
Verdict: Safe if checksum-verified and used on isolated/legacy hardware. Not recommended for daily use on internet-connected Windows 10/11 machines.
Here’s an interesting feature breakdown for zoiper-free-3.15-setup.exe — the free version of the popular VoIP softphone. For most users, downloading the current Zoiper 5
If you decide to remove the software or upgrade to a newer version, follow these steps: