Only had time for quick comments
First, even for the pure telephone case, the general industry term is teleconference, not conference call. Second, this article is mixing quite a few different technologies, such as video and web, which are not considered "teleconferencing" in the telecommunications industry. Within some of the discussion here, an online IRC chat also should qualify.
A better statement of scope is really needed. I, however, have a more immediate requirement of rehydrating some porcini mushrooms. As Douglas MacArthur put it, possibly muttering "the Imperial Japanese Navy willing", "I shall return." Howard C. Berkowitz 19:13, 21 January 2009 (UTC)