2-port VIC2-2FXS VIC
An FXS interface connects directly to a standard telephone, fax machine, PBX, or similar device, and supplies ring, voltage, and dial tone to the station.
An FXO interface connects local calls to a public switched telephone network (PSTN) central office or to a PBX that does not support E&M signaling. This is the interface a standard telephone provides.
An E&M interface connects remote calls from an IP network to PBX trunk lines (tie lines) for local distribution
To configure the ports on the 2-port VIC2-2FXS VIC, the 2-port VIC2-2FXO VIC and the 4-port VIC2-4FXO VIC2-2E/M, refer to Cisco.com
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