I had one of those phones in my "office" once. That sound strikes terror in my heart, since every call coming in would start with: "Hey Rob, I've got a customer on the line with me and he's got a problem with . . ."

Did you ever use that awful "Are you there?" Cisco "ring". That one could make anyone jump out of there skin. Here they are. The female one was even more startling than the male, but both were just terrifying.