[ClosedTalk] 1.4.1 that could have been downloaded from our website for free. [ClosedTalk] lies within Communication Tools, more precisely Instant messaging. The actual developer of the free software is CE-Infosys Pte Ltd.
From the developer:
[ClosedTalk] is a secure VoIP solution for internet talk in total privacy. [ClosedTalk] provides user privacy, the confidence in the Identity of your talk partner and all other benefits of a VoIP solution. All data to establish a connection and the actual voice data are transmitted in an encrypted format.
You may want to check out more software, such as Air Messenger LAN Server or eXeSMS, which might be similar to [ClosedTalk].