I believe this looks like a standard channel bank.  Asterisk generates all 
audio.  Ring and hook status are sent out of band.  Dial tones are in-band.  
Ringback, busy, congestion are in-band audio.  I would think a standard T1 card 
would be fine.

That said, I would verify this with the LEC. 

On Nov 7, 2010, at 1:22 PM, "Cary Fitch" <ca...@usawide.net> wrote:

> Alternate question:
> 
> Asterisk/PSTN oriented.
> 
> If an Asterisk system were interfaced via a T1 to a local telco loop to a
> customer premises:
> 
> (This is not a T1 to the customer premises, but a T1 to the telco who then
> demuxes it to copper to the customer premises.  IE. In Telecom terms an
> EEL.)
> 
> Will Asterisk handle that scenario with common drivers and cards?
> 
> Who generates the customer audio "comfort sounds", ringing, busy, etc?
> 
> 
> 
> Cary
> "I know a lot, but not everything."
> 
> 
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