asterisk users - Nov 2004 - how to modify dsp.c so that It can detect busytone outside US?

how to modify dsp.c so that It can detect busytone outside US?
I have a X100P connected to my analog PBX. I can´t
detect hangups on this line
While the line is connected to the PBX, I can never detect busy and the
line hangs at the end of every call.
How can I adjust the detection routines to the tone I´m getting?  I
have tried to mess with busy_min, busy_max etc on dsp.c with no luck.

in /etc/asterisk/zapata.conf
busydetect=yes
busycount=4
callprogress=no

when set callprogress=yes ,can not answer the call.
BUT busydetect can not  detect hangup,callprogress can not detect hangup
outside US,
Tone plan :
busy tone    450Mhz 0.35s<On Time(ms)> 0.35<Off Time(ms)
how to modify dsp.c to detect busy tone  450Mhz 0.35s<On Time(ms)>
0.35<Off Time(ms)?
thanks


dsp.c
#ifdef BUSYDETECT_MARTIN
int ast_dsp_busydetect(struct ast_dsp *dsp)

I find that it is not 1 .
((hittone >= dsp->busycount - 1) && (hitsilence >=
dsp->busycount - 1) &&
(avgtone >= BUSY_MIN && avgtone <= BUSY_MAX) &&
(avgsilence >= BUSY_MIN &&
avgsilence <= BUSY_MAX)


2004-11-12 14:32:04 DEBUG[26996]: dsp.c:1320 ast_dsp_busydetect: TEST
show: dsp->busycount - 1:3,hittone:0 ,hitsilence :0, avgtone 270 ,
avgsilence 100