VoIP Development Kit
The VoIP Development Kit is a Voice over IP software development framework; it aims to be employed by a wide variety of users in very different scenarios.
It was created so it could run on many different platforms: Windows, Linux (both 32 and 64 bit) and MacOs X versions are available (Windows Mobile 6.x port is being worked on); the main target programming language is C++ but there are modules to use it with Java and Visual Basic as well, other ports (python and php) are being considered.
Thanks to its VirtuaDev technology every single media source on your PC is seen as a VDK Virtual Device:
i.e. microphones are input devices while speakers are output devices; audio files stored on your hard disk can be seen as input (play) or output (record) devices and, obviously, VoIP calls are both input and output devices at the same time.
Any of these devices can be connected with each other (i.e. any number of input device can be connected to any number of output devices) and the media stream will automagically flows from the former to the latter and mixed seamlessly without any user’s interaction but a single API call.