Installation guide

AP-IP200 IP Phone Installation Guide (Release 1.00E) Aug. 2005
AddPac Technology Proprietary & Documentation 93 - 88
between the user and the ISP. Developed in 1994 by the IETF and
superseding the SLIP protocol, PPP establishes the session between the
user's computer and the ISP using its own Link Control Protocol (LCP). PPP
supports PAP, CHAP and other authentication protocols as well as
compression and encryption.
Protocol Stack
Any set of communication protocols, such as TCP/IP, that consists of two or
more layers of software and hardware. It's called a stack because each layer
builds on the functionality in the layer below
PSTN
Public Switched Telephone Network – term for the entire, world-wide
telephone network. Sometimes refers to as POTS.
PVC
Permanent Virtual Circuit or permanent virtual connection. A continuously
available communications path that connects two fixed end points.
Q.931 Signaling
ITU-T specification for network layer of ISDN. Q.931 uses out-of-band
signaling on the D-channel to control calls.
QoS
This refers to the assumption that data transmission rates, error rates, and
other characteristics can be measured, improved, and to some degree,
guaranteed in advance. Basically, QoS describes a collective measure of the
level of service a provider delivers to its customers or subscribers.
RAM
Random-Access Memory, a non-retentive memory, whose contents get lost
after a switch-off or reset. Application programs run in the random access
memory and data is stored and processed.
RAS
Registration Admission Status protocol. The communication protocol used to
convey registration, admission and status messages between H.323 endpoints
and the gatekeeper.
RISC
Reduced Instruction Set Computing
Router
On the Internet, a router is a device or, in some cases, software in a computer,
that determines the next network point to which a packet should be forwarded
toward its destination. The router is connected to at least two networks and
decides which way to send each information packet based on its current
understanding of the state of the networks it is connected to. A router is
located at any gateway (where one network meets another), including each
Internet point-of-presence. A router is often included as part of a network
switch. Compare with: gateway. Refer to: relay.
RS-232
Most common Physical Layer interface. Known as EIA/TIA-232.
RTCP
Real-time Control Protocol (RTCP) is a companion protocol of RTP that is
used to maintain quality of service. Refer to: RTP(Real-Time Transport
Protocol).
RTP
1. Routing Table Protocol, VINES routing protocol based on RIP. Distributes