Hi, A customer has a Avaya PBX and is looking to migrate to Asterisk, they have a T1 from the telco going into a CSU and then from the CSU to the Avaya PBX. They will buy a Digium T1 card for the Asterisk, can this T1 coming from the Telco plug directly into the Digium card or do they still need a CSU? Thanks for any advice! Oswaldo