Sirrix Hardware-switched ISDN cards are easy to install, provide extensive stability and enable highly-flexible applications. Some features of Sirrix interface cards:

PCI-Card 4 BRI ports ports can be used as internal or external ports (TE / NT - Mode) programmable gate array on board (FPGA) encryption with zero-delay (optional) switchable 100 Ohm terminations Internal 40V power supply  (optional module: Sirrix.PS40V-A) integrated Sirrix PCM bus Channel-driver for Asterisk PBX software				Please press here to enlarge to picture. Please press here for a detailed picture of the Sirrix.PCI4S0
You can get more information about Asterisk, and how to used it with our BRI-cards on www.asterisk.org, with Digium, or www.voip-info.org. Please also take a look at our FAQ.  Continue...  Do you want to purchase Sirrix products? Contact our sales!				Sirrix.PCI4S0 Datasheet