[asterisk-users] Billing pulses

[Stefano Corsi]

Hello,

I've discovered that in Italy ISDN lines can be 
programmed to generate a "billing pulse" every n 
seconds (it dipends from the pricebook). The pulse has these figures:

frequency 
.................................................................... 
12 kHz ± 1%

level 
.......................................................................... 
200 mVrms on 200

distortion................................................................... 
< 5%
pulse duration 
.............................................................125 ± 25 ms
pause duration 
................................................................> 180 ms
period 
.......................................................................> 300 ms

Does someone know if these values can be used 
somehow to get an accurate billing using asterisk 
with these lines? Could be a matter of configuration or programming?

Thanks
Stefano