| Invalid Number Tones |
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 L. Hao (lhao@NOSPAMcomcast.net)Mon, 31 Jan 2005 22:30:41 -0800
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I need to design an algorithm to detect call progress. For example, it needs to figure out whether the call hits a live person, an answering machine, a fax machine, and etc. But among all these things, I am having trouble finding the spec for this so-called invalid number. When you dial an invalid number, you normally get a tone followed by " the number you just dialed ...". Can anyone tell me where I can find the spec for this tone? Or better yet, if anyone can share his/her methods of detecting it, it'd be great.
Thanks for the help.
Li |
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