it think Avaya is based in Linux and Vxworks, Cisco Call Manager i think is based in MS Windows server thats why im still wondering why people like this Cisco Call Manager, and confused as well if the survey on the market share is correct,in my location most of the big companies are with Nortel or Avaya, there are few mid-size companies goes to Cisco,is that the case in USA and UK that Cisco is #1 or #2 ??