That’s a fax board? Do people use it for voice or just for fax?
Let the customer down gently, their previous investment in Brooktrout TR1034’s is just going to have to go down as depreciation to zero - unless they can get something for them on Ebay.
The card isn’t supported by chan_dahdi, that’s for sure. If there’s some other wacky way to make it work, you’ll only regret going that route in the long term - hassle, frustration, anger, etc.