Zoiper has a rating of 4 stars from 1 review, indicating that most customers are generally satisfied with their purchases. Zoiper ranks 40th among Voip sites.
It is a good alternative for zoom or skype when you need to reach someone by a phone number from your desktop. Lots of usufel features even without the premium pack they offer. I have never experienced any issues with connections when I was making local calls, could get more tricky with international calls.