VT2442 Voice Gateway User Guide
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Overview
Installation
Troubleshooting
Contact
FAQ
Glossary
License
Configuration:
Basic Advanced TCP/IP
Wireless
OOB DTMF
Out-of-Band Dual-Tone Multi-Frequency protocol for voice traffic.
PING
A network utility that tests host reachability by sending a small packet to the host and waiting for a
reply. If you PING a computer IP address and receive a reply, you know the computer is reachable
over the network. It also stands for “Packet InterNet Groper.”
port
On a computer or other electronic device, a port is a socket or plug used to physically connect it to
the network or to other devices.
In TCP/IP, a port is a number from 0 to 65536 used logically by a client program to specify a server
program. Ports 0 to 1024 are reserved.
port triggering
A mechanism that enables incoming communication with specified applications. Primarily used for
gaming applications.
POTS
“Plain old telephone service;” basic analog telephone service. POTS uses the lowest 4 kHz of
bandwidth on twisted pair wiring.
PPP
Point-to-Point Protocol is a method to establish a network connection or session between hosts.
PPPoE
Point-to-Point Protocol over Ethernet is a specification for connecting to the Internet used with DSL
modems.
PPTP
Point-to-Point Tunneling Protocol encapsulates other protocols to create VPNs. It is developed
jointly by several vendors.
private IP
address
An IP address assigned to a computer on the VT2442 LAN by the DHCP server on the VT2442 for a
specified lease time. Private IP addresses are used by the VT2442 LAN only; they are invisible to
devices on the Internet. See also
public IP address
.
PSTN
The public switched telephone network is the traditional circuit-switched, voice-oriented telephone
network. See also
POTS
.
public IP
address
A public IP address is visible to devices on the Internet. See also
private IP address
.
QoS
quality of service
RIP
Routing Information Protocol enables routers to exchange routing information with other network
routers. Any RIP-enabled router:
•
Sends automatic update packets containing its routing table periodically (every 30 seconds)
•
Accepts periodic updates from other routers and adds, deletes, or modifies routes in its routing
table accordingly
•
Responds to requests for its routing table
RTP
Real Time Protocol for voice traffic.
RJ-11
The most common type of connector for household or office phones.
RJ-45
The most common type of port for Ethernet networks.
router
On IP networks, a device connecting at least two networks, which may or may not be similar. A
router filters data based on the IP address, examining the source and destination IP addresses to
determine the best route on which to forward it.
server
A dedicated computer that supplies files, data, or services to other “client” computers or devices.
SIP
Session Initiation Protocol for voice traffic.
S-MTA
A standalone media terminal adapter converts analog voice signals to and from a standard
telephone to digital data that can be transmitted through a broadband connection over the Internet.
SSH
secure shell
stateful
inspection
A type of firewall that tracks each connection traversing all firewall interfaces to ensure validity. In
addition to examining the source and destination in the packet header based on static rules, a
stateful inspection firewall:
•
Examines packet headers on context established by previous packets that traversed the firewall
•
Monitors the connection state and saves it in a table
•
Closes ports until a connection to a specific port is requested
•
May examine the packet contents up through the application layer to determine more than just the
source and destination
A stateful-inspection firewall is more advanced than a static filter firewall.
