VoIP EVO SDK simplifies enabling VoIP on websites and applications. It includes a high-performance VoIP conference client for crystal clear sound quality on both low and high bandwidth connections.

The SDK supports VoIP conferencing in full duplex, making it a great choice for multi-user conferences. It comes with both Windows and Linux servers that can run as services, and is compatible with DirectSound as well as Windows Audio. Remote console server administration is also available, allowing for telnet control of the server.
There are two SDK versions available: the VoIP EVO Client SDK and the VoIP EVO Admin SDK, both of which offer robust features for developers. The SDK offers user status control, including participant availability and status messages, as well as full control over rooms/channels and their protection. Private and public instant text messaging is supported, as well as broadcast server messages and channel messages, making it easy to communicate with all connected users.
The SDK also offers advanced features such as cryptography, with SSL for TCP data transmission and BLOW FISH for UDP data transmission, to ensure secure encryption and decryption (only available in the Secure Edition). Users can be arranged in rooms/channels with topics and passwords, and the SDK includes a "get user talking" function to check whether a user is actively speaking. Finally, the SDK includes fully updated examples with source code, and has phased out the OCX (though version 2.2 is still available).
Version 3.0: The most important new feature is the ability for the admin to record conversations to files. The admin can now also stream .wav files to clients. Volume levels can now be controlled by AGC (automatic gain control) so all users have the same audio level.