3.5 — Zoiper

| Feature | Zoiper 3.5 (Legacy) | Zoiper 5/6 (Modern) | MicroSIP (Free) | | :--- | :--- | :--- | :--- | | | ~45 MB | ~200 MB | ~15 MB | | OS Support | Win 7, 8, 10, Linux | Win 10/11, macOS, iOS | Win 7 to 11 | | Video Calls | No | Yes (Pro) | No | | Encryption (TLS/SRTP) | Limited | Full support | Full support | | Cost | $29 (One-time, legacy) | $59/Year (Subscription) | Free (Donationware) | | Setup Complexity | Medium (Manual ports) | Low (Auto-config) | High (Manual) |

: Often used in professional environments due to its support for auto-answer, call transfer, and conferencing. Privacy-Conscious Users zoiper 3.5

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