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9
G
LOSSARY
CLI
Command Line Interface
CO
Central Office—connects to the PSTN.
DHCP
Dynamic Host Configuration Protocol—used to assign and manage IP
addresses for a network.
DNS
Domain Name Server
Failover
Backup system used to continue operations if the main device goes
down. During a power interruption, an analog telephone connected to
the failover can place emergency calls.
FXO
Foreign Exchange Office. Device interface that provides a CO
connection so that a VoIP device can connect to an analog signal.
Receives power (battery) and ring signals.
FXS
Foreign Exchange Station. Device interface that connects to an analog
device such as a telephone or fax machine.
LAN
Local Area Network.
LED
Light Emitting Diode. Lit or blinking LEDs on the device indicate
connection, signal transmission, and power supply.
MAC
Media Access Control. A MAC address is a hardware address that
uniquely identifies each network device.
MGCP
Media Gateway Control Protocol
PC
Personal Computer
Portable Document Format
POTS
Plain Old Telephone Service.
PSTN
Public Switched Telephone Network
SC
Session Controller
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