VaxVoice Extended SDK - Version 4.0 Vax Voice activeX is the easiest way to add PC-to-PC voice conferencing and text chat over the LAN, WAN or Internet in your applications and Web pages. Using Vax Voice activeX three or more persons can have a real time voice conference and during the conference, they can even record the conversation into wave (.wav) file for later play back.It also provides the feature to send/receive encrypted voice and text data over the Internet.