Verdict: A relic of the VoIP golden age—lightweight and reliable, but showing its age.
How to Get a Free Download of Zoiper 2.43 Zoiper 2.43 Free Download
Despite its age, the core engine of Zoiper is solid. Version 2.43 supports the standard codecs you would expect (G.711, GSM, and in some builds, G.729—though G.729 often requires a paid license). Review: Zoiper 2
No TLS/SRTP Encryption
Security is minimal – authentication is often plain text over UDP. Not recommended for business or sensitive calls. and in some builds