Terms Used in This Guide

802.1D 802.1Q	802.1Q defines a layer 2 frame structure that supports VLAN identification and a QoS mechanism usually referred to as 802.1D.
ARP	Address Resolution Protocol, used, for example, to verify that the IP Address provided by the DHCP server is not in use by another IP telephone.
CELP	Code-excited linear-predictive. Voice compression requiring only 16 kbps of bandwidth.
CLAN	Control LAN, type of Gatekeeper circuit pack.
CNA	Converged Network Analyzer, an Avaya product to test and analyze network performance.
DHCP	Dynamic Host Configuration Protocol, an IETF protocol used to automate IP Address allocation and management.
DiffServ	Differentiated Services, an IP-based QoS mechanism.
DNS	Domain Name System, an IETF standard for ASCII strings to represent IP Addresses.
Gatekeeper	H.323 application that performs essential control, administrative, and managerial functions in the media server. Sometimes called CLAN in Avaya documents.
H.323	A TCP/IP-based protocol for VoIP signaling.
HTTP	Hypertext Transfer Protocol, used to request and transmit pages on the World Wide Web.
HTTPS	A secure version of HTTP.
IETF	Internet Engineering Task Force, the organization that produces standards for communications on the internet.
LAN	Local Area Network.
LDAP	Lightweight Directory Access Protocol, an IETF standard for database organization and query exchange.
MAC	Media Access Control, ID of an endpoint.
Media Channel Encryption	Encryption of the audio information exchanged between the IP telephone and the call server or far end telephone.
NAPT	Network Address Port Translation.
NAT	Network Address Translation.
OPS	Off-PBX Station.
PHP	Hypertext Preprocessor, software used to assist in the format and display of Web pages.
PSTN	Public Switched Telephone Network, the network used for traditional telephony.
QoS	Quality of Service, used to refer to several mechanisms intended to improve audio quality over packet-based networks.
Registration Server	A SIP server that accepts REGISTER requests. The Registration Server places the information received in the requests into the location service for the domain the server handles.
RSVP	Resource ReSerVation Protocol, used by hosts to request resource reservations throughout a network.
RTCP	RTP Control Protocol, monitors quality of the RTP services and can provide real-time information to users of an RTP service.
RTP	Real-time Transport Protocol. Provides end-to-end services for real-time data such as voice over IP.
SDP	Session Description Protocol. A well-defined format for conveying sufficient information to discover and participate in a multimedia session.
Signaling Channel Encryption	Encryption of the signaling protocol exchanged between the IP telephone and the call server. Signaling channel encryption provides additional security to the security provided by media channel encryption.
SIP	Session Initiation Protocol. An alternative to H.323 for VoIP signaling.
SNTP	Simple Network Time Protocol. An adaptation of the Network Time Protocol used to synchronize computer clocks in the internet.
TCP/IP	Transmission Control Protocol/Internet Protocol, a network-layer protocol used on LANs and internets.
TFTP	Trivial File Transfer Protocol, used to provide downloading of upgrade scripts and application files to the IP telephones.
TLS	Transport Layer Security, an enhancement of Secure Sockets Layer (SSL). TLS is compatible with SSL 3.0 and allows for privacy and data integrity between two communicating applications.
UDP	User Datagram Protocol, a connectionless transport-layer protocol.
Unnamed Registration	Registration with Avaya Communication Manager by an IP telephone with no extension. Allows limited outgoing calling.
VLAN	Virtual LAN.
VoIP	Voice over IP, a class of technology for sending audio data and signaling over LANs.
WML	Wireless Markup Language, used by the 4620 Web Browser to communicate with WML servers.

802.1D
802.1Q

802.1Q defines a layer 2 frame structure that supports VLAN identification and a QoS mechanism usually referred to as 802.1D.

ARP

Address Resolution Protocol, used, for example, to verify that the IP Address provided by the DHCP server is not in use by another IP telephone.

CELP

Code-excited linear-predictive. Voice compression requiring only 16 kbps of bandwidth.

CLAN

Control LAN, type of Gatekeeper circuit pack.

CNA

Converged Network Analyzer, an Avaya product to test and analyze network performance.

DHCP

Dynamic Host Configuration Protocol, an IETF protocol used to automate IP Address allocation and management.

DiffServ

Differentiated Services, an IP-based QoS mechanism.

DNS

Domain Name System, an IETF standard for ASCII strings to represent IP Addresses.

Gatekeeper

H.323 application that performs essential control, administrative, and managerial functions in the media server. Sometimes called CLAN in Avaya documents.

H.323

A TCP/IP-based protocol for VoIP signaling.

HTTP

Hypertext Transfer Protocol, used to request and transmit pages on the World Wide Web.

HTTPS

A secure version of HTTP.

IETF

Internet Engineering Task Force, the organization that produces standards for communications on the internet.

LAN

Local Area Network.

LDAP

Lightweight Directory Access Protocol, an IETF standard for database organization and query exchange.

MAC

Media Access Control, ID of an endpoint.

Media Channel Encryption

Encryption of the audio information exchanged between the IP telephone and the call server or far end telephone.

NAPT

Network Address Port Translation.

NAT

Network Address Translation.

OPS

Off-PBX Station.

PHP

Hypertext Preprocessor, software used to assist in the format and display of Web pages.

PSTN

Public Switched Telephone Network, the network used for traditional telephony.

QoS

Quality of Service, used to refer to several mechanisms intended to improve audio quality over packet-based networks.

Registration Server

A SIP server that accepts REGISTER requests. The Registration Server places the information received in the requests into the location service for the domain the server handles.

RSVP

Resource ReSerVation Protocol, used by hosts to request resource reservations throughout a network.

RTCP

RTP Control Protocol, monitors quality of the RTP services and can provide real-time information to users of an RTP service.

RTP

Real-time Transport Protocol. Provides end-to-end services for real-time data such as voice over IP.

SDP

Session Description Protocol. A well-defined format for conveying sufficient information to discover and participate in a multimedia session.

Signaling Channel Encryption

Encryption of the signaling protocol exchanged between the IP telephone and the call server. Signaling channel encryption provides additional security to the security provided by media channel encryption.

SIP

Session Initiation Protocol. An alternative to H.323 for VoIP signaling.

SNTP

Simple Network Time Protocol. An adaptation of the Network Time Protocol used to synchronize computer clocks in the internet.

TCP/IP

Transmission Control Protocol/Internet Protocol, a network-layer protocol used on LANs and internets.

TFTP

Trivial File Transfer Protocol, used to provide downloading of upgrade scripts and application files to the IP telephones.

TLS

Transport Layer Security, an enhancement of Secure Sockets Layer (SSL). TLS is compatible with SSL 3.0 and allows for privacy and data integrity between two communicating applications.

UDP

User Datagram Protocol, a connectionless transport-layer protocol.

Unnamed Registration

Registration with Avaya Communication Manager by an IP telephone with no extension. Allows limited outgoing calling.

VLAN

Virtual LAN.

VoIP

Voice over IP, a class of technology for sending audio data and signaling over LANs.

WML

Wireless Markup Language, used by the 4620 Web Browser to communicate with WML servers.