NEC Electra Elite IPK II System Hardware Manual page 639

Electra Elite IPK II
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Abbreviations
PRI
SLIP
SMDR
SPID
VoIP
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System Hardware Manual
Primary Rate Interface
ISDN subscriber interface. PRI has 23 bearer B-channels at 64 Kbps
per second and a D-channel at 64 Kbps per second. The bearer
B-channels are provided for PCM voice, video conferencing, group 4
facsimile machines, and other similar types of transmissions. The data
D-channel is used to bring in information about incoming calls and take
out information about outgoing calls. PRI can also be used to access
slow-speed data networks such as videotex and packet switched
networks.
PRI has two standards:
U Interface for 2-wire
T Interface for 4-wire
Serial Line Internet Protocol
An Internet protocol is used to run IP over serial lines such as telephone
circuits. IP is the most important of all protocols on which the Internet is
based. This protocol allows a packet to traverse multiple networks
before it reaches its final destination.
Station Message Detail Recording
A feature that collects and records information on outgoing calls by
station.
Service Profile Identifier
ISDN service is ordered with certain parameters. The SPID is an 8- to
12-digit number that uniquely identifies the service ordered. The
telephone company assigns an SPID for every phone number. Each
ISDN BRI line usually has two telephone numbers.
The SPID is a label identifier that points to a particular location on the
telephone company central office memory that stores the details of the
ISDN services ordered. This number is necessary for the operation of
the ISDN telephone, fax, or PC software. Without this number, ISDN
services cannot be accessed.
Voice over Internet Protocol
The ability to carry normal telephone-style voice over an IP-based
internet with POTS-like functionality, reliability, and voice quality.
The Public Switched Telephone Network (PSTN) connects to the LAN
IP network through a VoIP gateway. Digitized speech is transported
through IP packets and can include real-time conversation or voice mail.
The IP network can be public or private, and voice transport can be
telephone-to-telephone, computer-to-telephone, or
computer-to-computer.
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