This is a free download best suited for tech-savvy users. There is no "one-click setup." You need your SIP provider details, proxy information, and codec preferences. The settings menu is a maze of checkboxes and dropdowns that can be intimidating for a casual user simply wanting to make a call.
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. Zoiper 2.43 Free Download