Ilt-in, Router, Server – Motorola VT2442 User Manual
Page 78: Gure, Pppoe, Pptp
VT2442 Voice Gateway User Guide
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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.