Well Asterisk can do SIP, IAX2 and Zaptel. Already it uses modems as FXO ports with the zaptel driver, and Digium makes T-1 cards, so I am sure it can be done. The bad thing is that a specialized interface for T-1 is rare and extremely overpriced. I always wondered why someone didn't make a T-1 to Ethernet converter. So the Adtran 900 can do SIP within the device? Sort of like a multi-port SIP ata box then? As for the CarrierAccess box, is there anyway I can get documantation for it?
