Networking & Servers > Modems & Routers > Router Memory & Modules
This 6-port FXO voice and fax expansion module provides off-premises connection to the central office. This module supports FXO power failover. If power to the router fails, this feature helps enable a direct metallic path between an FXO port and a special "red" telephone to provide a direct line to the PSTN.
| Device Type | Voice / fax module - Expansion Slot |
| Form Factor | Internal |
| ISDN Interface | FXO |
| Analogue Ports Qty | 6 |
| System Requirements | Cisco IOS 12.3(11)T or later |
| Designed For | Cisco 2821, 2821 V3PN, 2851, 2851 V3PN, 2901, 2911, 2921, 2951, 3825, 3825 V3PN, 3845, 3845 V3PN, 3925, 3925E, 3945, 3945E |
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