PCI Cards
Sangoma has the most complete product portfolio which includes a100 PRI cards (1-8 ports), the a200 and a400 modular analog cards (up to 24 ports) as well as modular a500 BRI cards (up to 24 ports). All cards are available in either PCI-X or PCI-e format with or without echo cancellation. In addition Sangoma recently introduced an inexpensive range of non-modular analog cards under the B600 as well as hybrid FlexBRI range which combines analog and BRI ports. All cards are 2U form factor making them ideal for compact servers.
At the moment NetBorder Express software can be used with the a100 PRI cards and a200 analog cards. Please note that cards need to have echo cancelation chip to work with NetBorder.