While modern communication has shifted toward unified communications and team collaboration apps like Microsoft Teams or Slack, the backbone of business telephony remains SIP (Session Initiation Protocol). For over a decade, has been a leading name in softphone clients. Among its many iterations, Zoiper 3.5 stands out as a significant milestone—celebrated for its stability, feature set, and cross-platform maturity.
| App | Free Tier | Best for | |-----|-----------|----------| | (Windows) | Yes | Ultra-light, secure, still updated. | | Linphone (All OS) | Yes | Modern codecs, encryption, cross-platform. | | Zoiper 5 (Free) | Yes | If you like Zoiper but need security & video. | | Telephone (macOS) | Free | Simple, native SIP. | zoiper 3.5
If you have an old installer and run it on Windows 7 or an older Linux distribution, it will still make calls. However, this is not recommended for production use because: | App | Free Tier | Best for
However, it is obsolete (released ~2012). Do not use it for security, modern codecs, or team collaboration. | | Telephone (macOS) | Free | Simple, native SIP
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