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Custom phone signals detection --- Outgoing call, detect busy or ring-back tone demo in Delphi and VB6..

The telephony hardware such as voice boards has to be able to classify different signals such as ring-back, dial tones, busy signals, ringing. Historically, voice modems were designed to answer voice calls as if it was a fancy answering machine, and not to place calls. Many voice modems have little or no call progress detection capabilities

From the version 2.9.5, our control introducts a new interface IWaveAnalysis which implements accurate real FFT on audio wave-form. With help of it , it can detect the custom tone (such as busy, ring-back or.... of different countries) on phone.

Reference information

  • International Telephone Busy Signal Reference
  • International Telephone Ring-Back Signaling Reference


  • Note:
  • If you want detect the very phone signals and do not know how to set the parameters of IWaveAnalysis interface, you may record that signal in wave format, and sent it to us (email:techsupport@tapiex.com).
  • It can also use the "Advanced Tones Detection" to detect the custom tone signal.
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