you would have to backwards engineer the AVAYA PBX, emulate it on an asterisk environment and connect the proprietary digital AT&T phones.
Do you see the legal problem here? Avaya would hand them their asses on a platter.
it is a 2 wire connection not a LAN connection for the phone and it has almost the same values as a 2 wire ISDN connection with 2 b-channels and one d-channel, there is no engineering in the world that will make this thing work on any LAN. That would be the same as asking to make rotary dial phones work on IP. Two different animals.
There is a company called Citel that sells a SIP gateway for digital phones (several brands, avaya/lucent included). Check their site/brochure below and see if it is what you are looking for.
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