The mISDN modules & libs support HFC-S chipset based cards. The
developer is SUSE's Karsten Keil. chan_misdn is being developed by
Christian Richter from Beronet in Germany. Last week I heard that
Beronet, besides 4 and 8 port ISDN cards, now also has an E1 card.
Looking on http://www.colognechip.com I don't think it supports T1.
It doesn't look like vISDN supports T1 either.