Free by ZoIPer |

Zoiper IAX & SIP multilanguage and multiplatform (Windows, Linux and Mac OS X) softphone is a VoIP soft client, meant to work with any IP-based communications systems and infrastructure. Zoiper Classic BIZ provides secure high-quality voice calls and conference, fax sending and receiving functionality, and enhanced IP-calling features wrapped in a compact interface and small download size.

Comments About ZoIPer

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Simple, works, ok for testing

Positive Comment by alexander_rednax about ZoIPer Also mentioning: Blink X-Lite 7 days ago

Its free version is stable and simple, I always use it for testing. The only issue found so far is the UI design - it's terribly fancy-shmancy both in old (blue) verison and in new one (black and white).

Compared to Blink and X-lite, Zoiper worked for me without any additional change of settings. (Blink may cause problems with srtp, Xlite - with codecs)