I have worked with both, the Nortel and easier and more user friendly, but the BCM is just now catching up feature wise and with "all" that other systems can do. Really don't like either one as much as some others but hey they got the name recog. I think Avaya wants the base of the hospitals, Universities and want to grab them BEFORE Cisco does. I think it was a bad move from the Holding company of Avaya, but hey they are richer so what do I know LOL