The Digium AEX410 is a half-length PCI-Express x1 modular gateway card for connecting analog telephone stations and analog POTS lines through a PC. It supports a combination of up to four station or trunk modules for a total of 4 lines.
The AEX440E Includes
Four (4) Single Station (FXS) Module (Green)
Zero (0) Single Trunk (FX0) Module (Green)
One (1) 128ms Hardware Echo Cancellation Module