CalltoNET 2.1.0.35 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions among the program users are 2.1, 2.0 and 1.0.
You can set up this free PC software on Windows XP/Vista/7/8 32-bit. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The most frequent installer filename for the software is: CalltoNET.exe. This free software is a product of VoipSwitch. CalltoNET lies within Communication Tools, more precisely Instant messaging.
From the developer:
CalltoNET is a free PC dialer which allows you to make and receive calls directly from your PC. It features embedded VoIP tunnel technology and many other functionalities.
Its graphic user interface assures a high level of simplicity in order to be easy-to-use even by amateur PC users.
You may want to check out more software, such as Active Worlds, USRobotics Cordless Skype Dual Phone or Cordless DUALphone Suite, which might be related to CalltoNET.