Not exactly E1/T1 board, but...

["Alexey E. Suslikov" <cruel_(_at_)_texnika_(_dot_)_com_(_dot_)_ua>]

Dear misc_(_at_)_openbsd_(_dot_)_org,

PCI FXO card:

DigitNetworks X100P FXO
 http://www.digitnetworks.com/store/product_info.php?products_id=28&osCsid=1b9ac0b6c36d3758b52bd4bd961f7545

PCI DSL cards:

Alcatel SpeedTouch PC
 http://www.speedtouchdsl.com/prodpc.htm
AVM FRITZ!Card DSL
 http://www.avm.de/en/index.php3?Produkte/FRITZCard_DSL/index.html
Intel PRO/DSL 2200
 http://www.intel.com/network/broadband/modems/dsl_2200.htm
Celsian Momentum P30
 http://www.celsian.com/p30_tech.htm

Truly yours
 Alexey E. Suslikov