This book in its present form is the result of the analysed and reverse engineered audio communication of the jVoiceBridge, which is used in the Open Wonderland framework. The initial idea was to determine where the problem in the audio communication is, how the problem can be solved and to implement the solution in an FCS (First Customer Shipment). The main analysis, including the reverse engineering of the jVoiceBridge was created in a self-installed test environment. The test environment was installed in a VM. It consisted of an Ubuntu OS for the Wonderland Server, a simulated Internet and a NAT-Router on the client side of the network.