iSoftPhone Classic 4.1

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. Create private telephone networks by using the option to add multiple SIP providers.