Download of iSoftPhone Classic 4.1 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The software lies within Communication Tools, more precisely Texting & Video calls. The actual developer of this Mac application is Xnet Communications GmbH.
From the developer:
iSP is an easy to use Internet phone for macOS using VoIP to provide crystal clear voice quality in an attractively sleek interface. The quick configuration will allow you to get talking to other iSP users in seconds. iSP is integrated with the macOS address book to make calls and manage contacts. Simply dial the number of the person you wish to talk with or select them from contacts to call.
You may want to check out more Mac applications, such as Classic Cameras, myTuner Classical or Classic FTP File Transfer Software, which might be related to iSoftPhone Classic.
System Optimization