ZoiperZoiper 
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Zoiper (Zoiper.exe). Zoiper Classic IAX & SIP multilanguage and multiplatform (Windows, Linux and Mac OS X) softphone is a VoIP soft client...
Reliable VoIP Calling and Softphone Control for Flexible SIP/IAX Communication
Make clear voice and video calls through any VoIP provider or PBX system. Easily set standard streaming video parameters—resolution, rendering, and more—while integrating smoothly with popular Internet browsers and mail clients such as Outlook, Lotus Organizer, and Thunderbird. Ideal for users seeking fast setup, stable performance, and professional communication tools.
Zoiper (the evolution of Idefisk) is a lightweight, easy-to-use softphone compatible with both IAX and SIP protocols. It supports multiple SIP/IAX accounts, handles up to six simultaneous lines, and offers dependable connectivity for remote work, business calls, and unified communications. Great for anyone searching for long-tail solutions like “best softphone for remote teams” or “secure VoIP app for small business.”
All essential softphone features are included—address book, hold, transfer, conference, and voicemail—plus T.38 fax over IP support and wide compatibility with PBX and VoIP service providers. Despite its simple interface, advanced configuration options are available for power users. Supported codecs include u-law, a-law, GSM, iLBC 20/30, speex, and G729 (optional). Versions are available for Windows, Linux, and Mac.
Zoiper supports multiple languages: English, German, French, Spanish, Dutch, Portuguese, Russian, and Japanese. A free demo version is available, with the option to upgrade to a full commercial license.