Cisco EM-HDA-3FXS/4FXO

The Cisco EM-HDA-3FXS/4FXO is an expansion module for Cisco Integrated Services Routers (ISRs). It provides additional voice connectivity options for the router by adding three Foreign Exchange Station (FXS) ports and four Foreign Exchange Office (FXO) ports. FXS ports are used to connect analog devices such as telephones, fax machines, or modems to the router, allowing them to make and receive calls over an IP network. FXO ports, on the other hand, are used to connect the router to the traditional telephone network, enabling the router to make and receive calls from analog phone lines. With the Cisco EM-HDA-3FXS/4FXO module, businesses can expand their voice communication capabilities by connecting analog devices and integrating them into their IP-based telephony systems.