[asterisk-users] Detecting answer with an analogue card

[George Camilleri]

So what's the problem with connecting Asterisk to the telco with ISDN and 
forgetting about analogue cards?
I think that you will get the correct records in the CDR and there should be 
no problems with billing etc.

George

----- Original Message ----- 
From: "Stefano Corsi" <scorsi at floo.it>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at lists.digium.com>
Sent: Monday, February 05, 2007 2:26 PM
Subject: Re: [asterisk-users] Detecting answer with an analogue card


> At 13.44 05/02/2007, you wrote:
>>On Monday 05 February 2007 5:18 am, George Camilleri wrote:
>> > How does going digital help?
>>
>>Digital calls have a state associated with them.  They can tell if the far 
>>end
>>actually picked up (i.e. answered) or not.  Analog devices can't do this, 
>>or
>>rather you can make them try (progressdetect) but it's difficult and as 
>>such,
>>results are unpredictable.
>
> Uhm... I still don't understand... Does call progress detection work 
> fairly well for analog cards with the US telephony system, or it's still 
> something experimental and randomly working? And if it's working in US, 
> how difficult can it be to port it to the (for example) Italian system?
>
> As an alternative, what about having a device (let's say Inalp Patton 
> gateways) connecting to the telco with ISDN and to Asterisk with 
> ethernet/SIP. Should I get correct ANSWER detection (and thus correct 
> billing CDR records) with this setup?
>
> Thanks and rgds
> Stefano
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