Did you know each manufacturer had a unique sound for their v90 handshake? This one sounds like a Lucent WinModem. (Based on listening to the sounds here[1]. Yay for RealAudio!) The USR/3Com modems were two "bongs" (four if the higher speed failed). But I was always fond of the Rockwell sweep[2].
Of course, required reading is HN favorite Oona Räisänen's excellent analysis of a modem handshake.
[1] http://modemsite.com/56k/trouble3.asp
[2] https://www.youtube.com/watch?v=vvr9AMWEU-c
[3] http://www.windytan.com/2012/11/the-sound-of-dialup-pictured...