Zoiper’s official website (Zoiper.com) typically hosts only the last three major versions. As of 2025, they may have removed 2.43 from their primary download servers. However, they maintain a for paid customers. The "free" version of 2.43 is technically Freeware , meaning you do not need a license key for basic SIP calling.
| Component | Minimum Requirement | | :--- | :--- | | | Windows XP (SP3), Vista, 7, 8, 10 (32-bit or 64-bit) | | Processor | 300 MHz or higher | | RAM | 128 MB (512 MB recommended for call recording) | | Hard Disk Space | 50 MB | | Sound Card | Full-duplex (any modern sound card works) | | Internet | Broadband (minimum 100 kbps up/down for G.711) | Zoiper 2.43 Free Download
: You can find the Zoiper Classic installer on the Zoiper Classic Download Page . Zoiper’s official website (Zoiper
| Requirement | Spec | |-------------|------| | OS | Windows XP / Vista / 7 (32/64-bit), Linux, or Mac OS X 10.5–10.6 | | CPU | 500 MHz | | RAM | 256 MB | | Internet | Broadband (min 100 kbps) | The "free" version of 2