Only the current version so far — new entries appear as the app ships updates.
Smart電話 - IP電話アプリ is a social app by Cosmosplus Inc. with 1,000+ downloads (about 4.4K estimated). +2 installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “It is an IP phone application for members only. After installation, return to the web screen and start it with the "TV" or "Voice" button on each member's screen.”