quote:
Originally posted by gurindersm
If they are not public could you please guide me how can i procure the SDK.
Your best bet is to to open the messenger executables in a resource editor and extract the Type library resources. From there you can examine which interfaces are supported and perhaps discover a way. The older versions of messenger probably do not have any API to control voice calling, however the newer versions appear to have a "Hover To Call" API that you may be able to figure out.