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Issue 2.2 April 2005 13
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.
NAPT Network Address Port Translation.
NAT Network Address Translation.
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.
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.
SIP Session Initiation Protocol. An alternative to H.323 for VoIP signaling.
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.
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.
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