If you are maintaining a legacy call center running on Windows XP embedded systems, or you hate the "modern" ribbon UI of new softphones, Zoiper 2.43 is a reliable workhorse. It does one thing—turn your PC into a phone—and does it well.
| Feature | Free (v2.43) | Premium (v2.43 - Legacy) | | :--- | :--- | :--- | | SIP & IAX2 | Yes | Yes | | Call Recording | No | Yes | | G.729 Codec | No | Yes | | Video Calls | No | Yes (H.263) | | Exchange Integration | No | Yes | | Multiple Lines | 1 line | 5 lines | Zoiper 2.43 Free Download
| 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) | If you are maintaining a legacy call center