... по аналоговым СО.
В каталоге DTA есть файл system.ini
Нужно просто изменить строку секции [Tones], касающуюся сигнала Busy:
[Tones]
; Tone definition section, used to define global detect tones.
; Tone definitions are of the form:
; Name=F1,F2,E,N1,N1D,F1,F1D,N2,N2D,F2,F2D,R
; where:
; 'Name' is the name of the tone being identified
; 'ID' is the number the tone is referenced by internally, do not change
; 'F1' is the first frequency (lower tone) in Hz
; 'F2' is the second frequency (higher tone, if any) in Hz
; 'E' is the tone detection edge, 1 for leading, 2 for trailing
; 'N1' is the first cadence tone on time in 1/100 of a second
; 'N1D' is the first cadence tone on time as a percentage
; 'F1' is the first cadence tone off time in 1/100 of a second
; 'F1D' is the first cadence tone off time as a percentage
; 'N2' is the second cadence tone on time in 1/100 of a second
; 'N2D' is the second cadence tone on time as a percentage
; 'F2' is the second cadence tone off time in 1/100 of a second
; 'F2D' is the second cadence tone off time as a percentage
; 'R' is the number of times the cadence is heard before recognition
;
; Leave any values that do not apply (second tone, repeats, etc.) at 0.
; Set to "ID,0,0,0,0,0,0,0,0,0,0,0,0" to disable.
; Valid tone names are: FaxReceive, FaxTransmit, Dial, Busy, and Reorder.
;
; Industry Standards:
; Fax Receive Tone: 2100Hz for 3000ms
; Fax Transmit Tone: 1100Hz +/-38Hz, 500ms On +/-15%, 3000ms Off +/-15%
; Dial Tone: 350Hz and 440Hz, continuous
; Busy Tone: 480Hz and 620Hz, 500ms On, 500ms Off
; Reorder Tone: 480Hz and 620Hz, 250ms On, 250ms Off
;
; Default values:
FaxReceive=5,2150,0,1,500,10,0,10,0,10,0,10,1
FaxTransmit=5,1100,0,1,500,15,0,10,0,10,0,10,1
; Dial=1,350,440,1,1000,10,0,10,0,10,0,10,2
; Busy=2,480,620,1,50,10,50,10,0,10,0,10,1
;Busy=2,400,0,1,500,10,500,10,0,10,0,10,2
Busy=2,425,0,1,350,10,350,10,0,10,0,10,2
; Reorder=3,480,620,1,25,10,25,10,0,10,0,10,1
И в меню Port Block нужно проверить опцию Disconnect Signal -> Busy tone.
Если у провайдера нестандартный Busy tone, нужно выяснить параметры сигнала "занято" у провайдера.