The X400M FXO module allows you to connect an additional four (4) analog PSTN telephone line to your existing TDM2400P, TDM800 or AEX800 board.

Because of the modular design, a user can activate additional ports at any time in groups of four, simply by adding more X400M or S400M daughter cards. The X400M module passes all the call features any standard analog telephone line will support.

You can also add the S400M FXS Module to connect more analog telephones to your TDM2400P.