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Glossary
98 Voice Gateways System Manual
PPPoE Point-to-Point Protocol over Ethernet. PPPoE relies on two
widely accepted standards: PPP and Ethernet. PPPoE is a
specification for connecting the users on an Ethernet to the
Internet through a common broadband medium, such as a
single DSL line, wireless device or cable modem. All the users
over the Ethernet share a common connection, so the Ethernet
principles supporting multiple users in a LAN combines with
the principles of PPP, which apply to serial connections.
REN Ringer Equivalency Number: A number determined in
accordance with the Code of Federal Regulations, Title 47, part
68, which number represents the ringer loading effect on a
line. A REN of 1 represents the loading effect of a single
traditional telephone set ringing circuit. Modern telephone
instruments may have a REN lower than 1.
RH Relative Humidity. The amount of water in the air relative to
the maximum amount of water that the air can hold at a given
temperature.
RTCP RTP Control Protocol. A protocol that monitors the QoS of an
RTP connection and conveys information about the on-going
session.
RTP Real Time Protocol. An Internet protocol for transmitting
real-time data such as audio and video. RTP itself does not
guarantee real-time delivery of data, but it does provide
mechanisms for the sending and receiving applications to
support streaming data. Typically, RTP runs on top of the UDP
protocol, although the specification is general enough to
support other transport protocols.
SIP Session Initiation Protocol. An application-layer control IETF
protocol that can establish, modify, and terminate multimedia
sessions such as Internet telephony calls (VoIP). SIP can also
invite participants to already existing sessions, such as
multicast conferences. Media can be added to (and removed
from) an existing session. SIP transparently supports name
mapping and redirection services, which supports personal
mobility - users can maintain a single externally visible
identifier regardless of their network location.