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498 Voice API for Windows Operating Systems Library Reference — November 2003
DX_CAP — call progress analysis parameters
ca_noanswer
No Answer. Length of time to wait after first ringback before deciding that the call is not
answered.
Default: 3000 Units: 10 msec
ca_pamd_failtime
PAMD Fail Time. Maximum time to wait for positive answering machine detection or positive
voice detection after a cadence break.
Default: 400 Units: 10 msec
ca_pamd_spdval
PAMD Speed Value. Quick or full evaluation for PAMD detection
• PAMD_FULL – Full evaluation of response
• PAMD_QUICK – Quick look at connect circumstances
• PAMD_ACCU – Recommended setting. Does the most accurate evaluation detecting live
voice as accurately as PAMD_FULL but is more accurate than PAMD_FULL (although
slightly slower) in detecting an answering machine. Use PAMD_ACCU when accuracy is
more important than speed.
Default: PAMD_ACCU
Springware Boards
On Springware boards, the fields of the DX_CAP data structure are described as follows:
Note: A distinction is made in the following descriptions between support for PerfectCall
call progress analysis (PerfectCall CPA only), basic call progress analysis (Basic CPA
only), and call progress analysis (CPA).
ca_nbrdna
Number of Rings before Detecting No Answer. The number of single or double rings to wait
before returning a “no answer” (Basic CPA only)
Length: 1 Default: 4 Units: rings
ca_stdely
Start Delay. The delay after dialing has been completed and before starting analysis for
cadence detection, frequency detection, and positive voice detection (CPA)
Length: 2 Default: 25 Units: 10 msec
ca_cnosig
Continuous No Signal. The maximum time of silence (no signal) allowed immediately after
cadence detection begins. If exceeded, a “no ringback” is returned. (CPA)
Length: 2 Default: 4000 Units: 10 msec
ca_lcdly
Loop Current Delay. The delay after dialing has been completed and before beginning loop
current detection. (CPA) The value -1 means disable loop current detection.
Length: 2 Default: 400 Units: 10 msec
ca_lcdly1
Loop Current Delay 1. The delay after loop current detection detects a transient drop in loop
current and before call analysis returns a “connect” to the application (CPA)
Length: 2 Default: 10 Units: 10 msec