[asterisk-users] Detecting answer with an analogue card

[Stefano Corsi]

At 19.22 04/02/2007, you wrote:
>>>if you want exact cdr records, you must go digital.
>>There's still something I don't understand: when using a simple 
>>modem on an analog line, you get correct answers from the modem: 
>>"NO ANSWER", "BUSY", "NO DIALTONE", etc... why is this possible 
>>with these TDM2400 cards that cost twenty times as much?
>>I know that I'm probably missing something... could you help me 
>>understand what?
>
>Because the far end sends a carrier tone.

Ok, understood.
I see there's a call progress detector for Asterisk that seems to 
work only with the US telephony system. In fact, when I try to use it 
in Italy, results are completely random... it partially works for 
local calls that last longer than 20 seconds, but doesn't absolutely 
work with call addressed to cell phones, for example. Is there a way 
to configure it to work with other telephone systems? Is there 
someone who has tried to do it, for example, with the italian 
telephony system or some other european telephony system?

Thanks and best regards
Stefano