Quick tech specs
- Voice / fax module
- FXS/FXO
- for Cisco 2811
- 2851
- 2921
- 3825
- 3925
- 3945
- expansion slot
- analog ports: 7
- 2821
- 2911
- 2951
- 3845
- 3925E
Know your gear
This 3-port FXS and 4-port FXO voice and fax expansion module provides on-premises FXS signaling to connect directly to a standard telephone, fax machine, or similar device and supplies ring, voltage, and dial tone. In addition, the FXO ports provide off-premises connection to the central office. FXS signaling support available includes loop-start and ground-start. There is no DID support. In addition, there is no FXO power failover support on the FXO ports.