TAPI_DETECTTONE structure (tapi3if.h)

The TAPI_DETECTTONE structure describes a tone to be monitored. This is used as an entry in an array.

Syntax

typedef struct TAPI_DETECTTONE {
  DWORD dwAppSpecific;
  DWORD dwDuration;
  DWORD dwFrequency1;
  DWORD dwFrequency2;
  DWORD dwFrequency3;
} TAPI_DETECTTONE, *LPTAPI_DETECTTONE;

Members

dwAppSpecific

Used by the application for tagging the tone. When this tone is detected, the value of the dwAppSpecific member is passed back to the application.

dwDuration

The duration, in milliseconds, during which the tone should be present before a detection is made.

dwFrequency1

The frequency, in hertz, of a component of the tone.

dwFrequency2

The frequency, in hertz, of a component of the tone.

dwFrequency3

The frequency, in hertz, of a component of the tone. If fewer than three frequencies are needed in the tone, a value of zero should be used for the unused frequencies. A tone with all three frequencies set to zero is interpreted as silence and can be used for silence detection.

Requirements

Requirement	Value
Header	tapi3if.h

See also

ITLegacyCallMediaControl2::DetectTones

ITLegacyCallMediaControl2::DetectTonesByCollection

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