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Voice API for Windows Operating Systems Library Reference — November 2003 23
Function Summary by Category
1.12 Global Tone Detection (GTD) Functions
The global tone detection (GTD) functions define and enable detection of single and dual
frequency tones that fall outside the range of those automatically provided with the voice driver.
They include tones outside the standard DTMF range of 0-9, a-d, *, and #.
The GTD dx_blddt( ), dx_blddtcad( ), dx_bldst( ), and dx_bldstcad( ) functions define tones
which can then be added to the channel using dx_addtone( ). This enables detection of the tone on
that channel. See the Voice API Programming Guide for a full description of global tone detection.
The global tone detection functions are:
dx_addtone( )
adds a user-defined tone
dx_blddt( )
builds a user-defined dual frequency tone description
dx_blddtcad( )
builds a user-defined dual frequency tone cadence description
dx_bldst( )
builds a user-defined single frequency tone description
dx_bldstcad( )
builds a user-defined single frequency tone cadence description
dx_deltones( )
deletes all user-defined tones
dx_distone( )
disables detection of user-defined tones
dx_enbtone( )
enables detection of user-defined tones
dx_setgtdamp( )
sets amplitudes used by global tone detection (GTD)
1.13 Global Tone Generation (GTG) Functions
Global tone generation (GTG) functions define and play single and dual tones that fall outside the
range of those automatically provided with the voice driver.
The dx_bldtngen( ) function defines a tone template structure, TN_GEN. The dx_playtone( )
function can then be used to generate the tone.
See the Voice API Programming Guide for a full description of global tone generation.
The global tone generation functions are:
dx_bldtngen( )
builds a user-defined tone template structure, TN_GEN