Download of IfonePlatinum 5.5.5 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus. The program is included in System Utilities. This free software was originally designed by Design4voip.
From the developer:
Directly interconnected with all the major voice and data carriers worldwide including North America and South America, Europe, Middle East and Asia for Tier-1 Voice termination. Extensive SIP based network spans across more than 240 countries through VoIP Tier-1 service providers.
You may want to check out more software, such as VideoCAM Look, GFI FAXmaker Client or ThinkPad Mobility Center Customization, which might be related to IfonePlatinum.