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500 Voice API for Windows Operating Systems Library Reference — November 2003
DX_CAP — call progress analysis parameters
ca_nsbusy
Non-silence Busy. The number of non-silence periods in addition to nbrdna to wait before
returning a “busy” (Basic CPA only)
Length: 1 Default: 0 Negative values are valid
ca_logltch
Low Glitch. The maximum silence period to ignore. Used to help eliminate spurious silence
intervals. (CPA)
Length: 2 Default: 15 Units: 10 msec
ca_higltch
High Glitch. The maximum nonsilence period to ignore. Used to help eliminate spurious
nonsilence intervals. (CPA)
Length: 2 Default: 19 Units: 10 msec
ca_lo1rmax
Low 1 Ring Maximum. Maximum short low duration of double ring (Basic CPA only)
Length: 2 Default: 90 Units: 10 msec
ca_lo2rmin
Low 2 Ring Minimum. Minimum long low duration of double ring (Basic CPA only)
Length: 2 Default: 225 Units: 10 msec
ca_intflg
Intercept Mode Flag. Enables or disables SIT frequency detection, positive voice detection
(PVD), and/or positive answering machine detection (PAMD), and selects the mode of
operation for SIT frequency detection (CPA)
• DX_OPTDIS – Disable SIT frequency detection, PAMD, and PVD.
• DX_OPTNOCON – Enable SIT frequency detection and return an “intercept”
immediately after detecting a valid frequency.
• DX_PVDENABLE – Enable PVD.
• DX_PVDOPTNOCON – Enable PVD and DX_OPTNOCON.
• DX_PAMDENABLE – Enable PAMD and PVD.
• DX_PAMDOPTEN – Enable PAMD, PVD, and DX_OPTNOCON.
Note: DX_OPTEN and DX_PVDOPTEN are obsolete. Use DX_OPTNOCON and
DX_PVDOPTNOCON instead.
Length: 1 Default: DX_OPTNOCON
ca_intfltr
Not used
ca_hisiz
High Size. Used to determine whether to use alowmax or blowmax (Basic CPA only)
Length: 2 Default: 90 Units: 10 msec
ca_alowmax
A Low Maximum. Maximum low before connect if high > hisiz (Basic CPA only)
Length: 2 Default: 700 Units: 10 msec
ca_blowmax
B Low Maximum. Maximum low before connect if high < hisiz (Basic CPA only)
Length: 2 Default: 530 Units: 10 msec