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D-16 VoIP Glossar y

Appendix D - Voice Over the Internet Protocol

VoIP Glossary

This table describes the Internet Telephony terms used in this section:

Term Definition

Asynchronous

Transmission

A method of data transmission which allows characters to be sent at irregular intervals by preceding each

character with a start bit and following it with a stop bit

bps Data bits per second, also known as Baud Rate

DTMF Dual Tone Multi-Frequency

Gateway Bridges H.323 conferences to other network communications protocol and multimedia formats

Header Protocol control information located at the beginning of a protocol data unit. This portion of a message

contains information that will guide the message to the correct destination by including sender’sand

receiver’s addresses, routing instructions, etc.

Hub A physical connection for multiple LAN devices. Commonly, 10/100 Base-T Ethernet support through a RJ-45

connection is provided.

IANA Internet Assigned Number Authority – the one agency that issues all IP addresses

ISP Internet Service Provider. A vendor who provides access to the Internet and World Wide Web.

Jitter Network-provided variations in latency for different packets, which is particularly disruptive to audio

communications.

LAN Local Area Network

Latency A term used to indicate waiting time or time delay in delivering packets over a network.

Octet Three digits between decimal points in an IP address. There are eight binary bits for numbers from 0-255,

making it an octet.

PSTN Public Switching Telephone Network

QoS Quality of Service

Router A unit that routes Packeted information interfacing two separate networks

TTL Time to Live. Used with the IP protocol, it is the time after which the packet can be deleted from the network.

This is typically measured in milliseconds.

VoIP Voice Over Internet Protocol

VPN Virtual Private Network. The definition is very broad. Typically, this means some form of “virtually private”

network created over a public network (i.e., the Internet) using encryption technologies to create a secure

connection between two or more sites.

WAN Wide Area Network. A computer or voice network bigger than a metropolitan area. Sometimes used to define

a network that spans a metropolitan area which could also be called a MAN (Metropolitan Area Network).

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