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Issue 4 August 2006 15
LLDP Link Layer Discovery Protocol. All IP Telephones with an Ethernet interface support
the transmission and reception of LLDP frames on the Ethernet line interface in
accordance with IEEE standard 802.1AB.
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.
PAE Port Access Entity. The protocol entity associated with a port. The PAE supports the
protocol functionality associated with the authenticator, supplicant, or both.
PHP Hypertext Preprocessor, software used to assist in the format and display of Web
pages.
PoE Power over Ethernet.
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.
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