Yes it works; after 6 days of try and fail and re-read the modem manual 10 times ( i am not joking ).
The best you can do : setup a second pc as a serial line sniffer; learn how to use it; snif a Windows com that work, snif e-smith and modify chat-ppp0 accordingly.
usually 2 ort 3 lines of AT... commands are sufficient.
The big difficult thing : know what ISDN protocol your ISP uses, most of them do not know themselves.
PS : we used one of the worst modem we have ever seen ASUS ST200 ISDN TA.
Hint : DO NOT BUY IT, tell that to your friends.
With a US robotics it worked after 3 minutes. Bad luck, it was not ours.
Good luck.