User`s guide

ManualsBrandsMultitech ManualsComputer equipmentVoIP

Internet Protocol (IP) -

A protocol used to route data from its source to its destination in an Internet environment. It

is a highly distributed protocol (each machine only worries about sending data to the next step in the route).

IP address (or Internet Address) -

A 32-bit address used by IP data networks to uniquely identify the location of a

device on a network. Normally printed in dotted decimal format (e.g. 129.128.44.227).

IP Gateway -

A network device that converts voice and fax calls, in real time, between the PSTN and an IP network.

IP Gatekeeper -

An H.323 entity that de nes the policies that govern the multimedia system (e.g. dialing plans, user

privileges, bandwidth consumption, etc.). It also provides the means to extract information from such a system for

billing or other purposes.

ISDN (Integrated Services Digital Network) -

Provides a digital telephone service which allows both data and voice

communication over the same telephone line and at signi cantly faster speeds than the traditional Plain Old

Telephone Service or analog service. There are two types of lines which provide access to ISDN, Basic Rate Interface

(BRI) and Primary Rate Interface (PRI). BRI provides two bearer or B channels and one signaling or D channel. PRI

provides 23 B channels and one D channel in the U.S. and 30 B channels and one D channel in Europe.

Jitter -

The variability in packet arrival at the destination. When consecutive voice packets arrive at irregular

intervals, the result is a distortion in sound, which if severe, can make the speaker unintelligible.

Key Telephone System (KTS) -

Phone devices with multiple buttons that let you select incoming or outgoing CO

phone lines directly. Similar to a PBX, except with a KTS you don’t have to dial a “9” for a call outside the building.

LAN (Local Area Network) -

Two or more computers linked together in a contained location; such as an of ce

building, allowing users to share  les and access to printers.

Latency -

Average “travel” time it takes for a packet to pass through a network. The lower the latency, the better the

voice quality.

Leased Lines -

Dedicated common-carrier facilities and channel equipment used by a network to furnish exclusive

private line service. Also called a leased circuit.

Packet -

A sequence of binary digits, including data and control signals, that is transmitted and switched as a

composite whole.

Packet-switched Network -

A method of transferring information in which data is broken into small pieces, called

packets, and transported over shared communications channels.

PBX (Private Branch Exchange) -

A phone exchange located on the customer’s premises. The PBX provides a circuit

switching facility for phone extension lines within the building, and access to the PSTN.

POTS (Plain Old Telephone Service) -

The basic analog phone service consisting of standard telephones, telephone

lines, and access to the public switched network.

PSTN -

The public switched telephone network that traditionally routes voice calls from one location to another.

QoS (Quality of Service) -

Refers to the measure of service quality provided to the user.

Router -

A device that connects two networks using the same networking protocol.

Silence Suppression/Voice Activation Detection -

In Voice over IP, silence suppression/voice activation detection

(VAD) is a software application that allows a data network carrying voice traf c over an Internet/intranet connection

to detect the absence of audio and conserve bandwidth by preventing the transmission of “silent packets” over the

network.

SIP (Session Initiation Protocol) -

A signaling protocol for setting up conferencing, telephony, multimedia and other

types of communication sessions over the Internet.

SNMP (Simple Network Management Protocol) -

The TCP/IP standard protocol that is used to manage and control

IP gateways and the networks to which they are attached.

Static IP Address -

An IP address that is permanently assigned to a network device by an ISP.

Subnet Mask -

A mask used to determine what subnet an IP address belongs to.