Digium Quad FXS Module (S400M)
The Digium S400M FXS module fits both the Digium TDM2400P and Digium TDM800P cards. The S400M module allows the card to terminate four analog telephones per module. Because of the modular design of these cards, users can activate additional ports at any time with more S400M daughter cards. The S400M module passes all the call features any standard analog telephone line will support.
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