Quad Span Isdn Pri T1 E1 Card TE420E Isdn Digital Pri SS7 Supports Freepbx Asterisknow Issabel Asterisk Card PCI Express Pci-e For Voip
Quad Span ISDN PRI T1 / E1 Card TE420E ISDN Digital PRI SS7 Supports Freepbx AsteriskNow Issabel Asterisk Card PCI Express (PCI-E) For VoIP more details