What is an SJphone profile?
It is a set of SJphone settings for a particular internet telephony service provider (ITSP) or other internet telephony calls. For internet calls and for calls to / from regular telephones, you need to purchase an account with ITSP. Install a new soft phone profile, initialize it with your login and password, and enjoy! Also you certainly can make direct host-to-host calls using PC-to-PC SIP or H.323 profiles for free.