The TDM410P is an 4-port analog telephony interface card with option slot for echo cancellation module
Digium TDM411B, TDM410P Analog PCI Card with1 FXS, 1 FXO, 0 Echo Cancellation Module
Digium TDM412B, TDM410P Analog PCI Card with1 FXS, 2 FXO, 0 Echo Cancellation Module
Digium TDM413B, TDM410P Analog PCI Card with1 FXS, 3 FXO, 0 Echo Cancellation Module
Digium TDM421B, TDM410P Analog PCI Card with2 FXS, 1 FXO, 0 Echo Cancellation Module
Digium TDM422B, TDM410P Analog PCI Card with2 FXS, 2 FXO, 0 Echo Cancellation Module
Digium TDM431B, TDM410P Analog PCI Card with3 FXS, 1 FXO, 0 Echo Cancellation Module
Digium Analog TDM PCI Card
TDM411E Bundle1 FXS 1 FXOHardware Echo Cancellation
TDM412E Bundle1 FXS 2 FXOHardware Echo Cancellation
TDM413E Bundle1 FXS 3 FXOHardware Echo Cancellation
TDM421E Bundle2 FXS 1 FXOHardware Echo Cancellation
TDM422E Bundle2 FXS 2 FXOHardware Echo Cancellation
TDM431E Bundle3 FXS 1 FXOHardware Echo Cancellation