Commonly Compared
Review of Zoiper powered by the Slant community.
Zoiper is a freemium, cross-platform VoIP/SIP softphone application to make voice calls through your PBX or SIP provider, available for Android, iOS, Windows 10, Linux, Windows Phone and MacOS.
SpecsUpdate
Ranked in these QuestionsQuestion Ranking
Cons
Con Free version very limited
It's near useless without paying for "pro".