If you are interested in conferencing applications, you will be interested to see a new source sample we introduced with SDK 4.0. Under the C++ tree you will find ConferenceService, which is a nice demonstration of how to write a conference app for Diva Server.
As the name implies, this is a sample that can be run as a Win32 service or from the console. It is a conference server that can run several concurrent conference rooms, with entrance to each conference room controlled via a pin code. The sample is complete with code for reading its configuration from the registry, so does make a very effective demonstration of what can be done. It will work both with Diva Server hardware and with SoftIP.