We do not have specific support for VOIP in Wwise. We do however provide a generic method of getting audio data into Wwise. Your best bet here is to take a look at an SDK Source Plug-in sample called "Audio Input". This plug-in allows you to use audio from an external source, for example a network stream, or a microphone connected to the PC's sound card. Searching for "Audio Input" in the Wwise SDK documentation help will provide much more information on this sample (including the Win32 Integration).