On Hook Off Hook Dial Tone
Reorder Tone Dialed Number Ring Current
Ring back Tone Busy Tone Fast Busy Tone
Call Waiting Tone   Special Dial Tone
Web Page Copyright: 國立政治大學資訊科學系 連耀南 lien@cherry.cs.nccu.edu.tw  signal.htm,  Fri Aug 22 11:59:55 CST 2008