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The Digium S110M FXS module enables you to connect an additional analog telephone to your existing TDM400, TDM410, TDM800, or AEX800 board. A user can activate additional ports at any time with more S400M daughter cards. With Digium's Asterisk Open Source PBX software, you can build your dream telephony environment with all of the high-end features of a business telephone system.