Can someone quickly tell me what exactly softphones do?
A softphone is an application program for making phone calls over the Internet using a general-purpose computer, tablet or smartphone. This software allows you to make high-quality, free calls. Most softphones work in conjunction with a headset and microphone connected to the computer.
If you need to try some softphone, I would advise going for the call.center™ app. It is a SIP-based softphone for iOs, Android, macOS (compatible with macOS Sierra and High Sierra) and Windows (compatible with Windows 7, 8 and 10). The call.center app is the only VoIP softphone designed for drag and drop use.
If you are interested, please visit: https://call.center/