The software-drivers for an ISDN card are always specific for each vendor of the card. Please let us point out that UMEC(Universal Microelectronics Co.Ltd.) is a transformer company - and not the manufacturer of ISDN cards. So we don't have any driver software made by ourselves.
We suggest you should try out the following web pages for driver download, because it is most likely that your PCI-card is made by one of the following manufacturers:

Askey (www.askey.com)
model name: TAS106H
card can be identified by the black
transformer module labeled "UMEC"
and UT28615.

Billion (www.billion.com.tw)
(for Germany: www.billion-deutschland.de)
model name: BIPAC PCI
Card can be identified by the black transformer module labeled "UMEC"
and UT 28624 and by the used
IC "HFC-S PCI A" from Cologne Chip

TigerJet (www.tjnet.com)
model name: ISDN PCI
Card can be identified by the black transformer module labeled "UMEC"and UT 21624AT