Digium - 1A4B04F 4 Port Modular Analog PCI-Express X1 Card w/ 2 Station And 2 Trunk Interfaces & HW Echo Can

4 port modular analog PCI-Express x1 card with 2 Station and 2 Trunk interfaces and HW Echo Can. Compatible with Switchvox 80, 310, 360, 380, 450 and 470 appliances.