[asterisk-users] Detecting answer with an analogue card

[Tzafrir Cohen]

On Mon, Feb 05, 2007 at 09:28:52AM +0100, Stefano Corsi wrote:
> 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?

Try patching dsp.c :-(

There are some tables there. You'll basically need to generate a new
progzone.

-- 
               Tzafrir Cohen       
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