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Version 5.22 - released Apr/21/2016. Release notes. - $100 US
- TLS, WSS, CLI, Public/private keys and certificate management
- live speech and automatic digit injection (perfect to test IVR)


Version 4.04 - released on Sept/28/2015. Release notes. - $60US
- Websockets



Version 3.48 - released on Sept/27/2015. Release notes. - $40US
- UDP, TCP


Version 2.40 - released on July/02/2013.
Unsupported version and It is no longer possible to buy a license for it.