 NASA's Johnson Space Center (JSC) in Clear Lake, TX was the push behind the 9000 series, with JSC eventually having a 13 node 9000VLCBX on its campus (replaced by a Siemens 9006i and later a Siemens HiPath switch).The various models of IBM produced ROLM 9751 CBX are 10, 20, 40, 50 & 70.PhoneMail (succeeded by eXpressions470 in later VoIP offerings from Siemens but using the same command structure and female "Silicon Sally" voice).