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Cisco

Cisco Voice, Fax, High-Density Voice, FXO, & FXS Network Modules

Cisco Analog and Voice/IDSN, FXO, FXS, & High-Density Voice Network Modules (HD, HDV) allow for conversion of telephone voice signals into a form that can be transmitted over an IP network and enable voice and fax traffic to be routed over data networks. The modules with expansion slots allow for the addition of Voice Interface Cards so you are able to add needed analog or BRI ports as your network expands.