Analysis of the modem tones: http://i.imgur.com/5Dq6K2U.png http://www.youtube.com/watch?v=vvr9AMWEU-c Historical telephony switching: http://www.youtube.com/watch?v=xZePwin92cI -- William King Senior Engineer Quentus Technologies, INC 1037 NE 65th St Suite 273 Seattle, WA 98115 Main: (877) 211-9337 Office: (206) 388-4772 Cell: (253) 686-5518 william.king@quentustech.com