ProCall is described as 'With ProCall Enterprise, companies are able to improve their communications and collaboration internally, as well as across company boundaries with partners, suppliers and customers. This makes employees’ day-to-day work more efficient and improves customer satisfaction' and is a Social Network in the social & communications category. There are three alternatives to ProCall for a variety of platforms, including Windows, Android, iPhone, Android Tablet and iPad apps. The best ProCall alternative is Linphone, which is both free and Open Source. Other great apps like ProCall are PhonerLite and SessionTalk SIP Softphone.