| 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.
Telephone Busy Signal Reference
Telephone Ring-Back Signaling Reference
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:firstname.lastname@example.org).
It can also use the "Advanced
Tones Detection" to detect the custom tone signal.