Line

ISDN line for operating a single ISDN terminal. This is usually a telecommunications system with the option of dialing to an extension. In comparison to the multiple connection, the line has the advantage that the number of extension numbers is not limited.

ACD

Automatic Call Distribution
Automatic call distribution

API

Application Programming Interface
Interface for application programs

Block Dialing

All numbers of the destination phone number are entered before the handset has been lifted. In this case, it is still possible to change the phone number after it has been entered. The phone number will be dialed completely (as a block) when the handset is lifted. The opposite of this is ‘Overlap Sending’.

CAPI

Common ISDN Application Programmable Interface

CAPI is the software interface, which regulates the data transfer between the ISDN card and the applications. The CAPI is a standard, which also supports the D-channel protocol of the Euro-ISDN (DSS1) in the CAPI Version 2.0.

CCITT

Comité Consultatif International Télégraphique et Téléphonique

International consulting committee for telegraph and telephone service; known as ITU-T today

CDR

Call Detail Record

A call detail record provides statistical information, such as caller, duration and cost of the connection.

Client computer

The client computer is a single workstation computer (PC). Many client computers are connected to a server via the network.

CMI

Cordless Multicell Integration
Multicellular wireless network for cordless equipment

CorNet®

A protocol developed by Siemens AG and used by SwyxPhone Lxxx to communicate with SwyxServer.

This connection is only used to transmit information to the server, e.g. via an activated button, and to send display information from the server to SwyxPhone. The actual telephony functions are carried out in SwyxServer.

CTI

Computer Telephony Integration

Term used for the connection of telecommunications systems and computer systems (e.g. databases) using a special interface. This enables the user to use telephony services from a computer.

DECT

Digital Enhanced Cordless Telecommunication
European Standard for the digital cordless communication between a base station and a transportable device for the range of a few hundred meters.

DHCP

Dynamic Host Configuration Protocol

DDI

Direct Dial In

DDI refers to the direct dial from a telephone network to a subscriber. Direct dial allows you to dial specific extensions directly via this number.

DMZ

Demilitarized Zone
In the context of firewalls, a DMZ is a protected logical network segment which contains the publicly accessible services of a company. Thus, a DMZ prevents external access to internal IT structures.

DNS

Domain Name Server

A server, which translates the symbolic name (e.g. www.microsoft.com) into an IP address.

DTMF

Dual Tone Multi Frequency

Seven different frequencies and additional mixture frequencies are transmitted in the telephone line in order to clearly communicate the activated button.

DSP

Digital Signal Processor

Direct Dialing-In line

ISDN line, to which a telecommunications system with so-called extension numbers is connected, which can be used to directly contact a subscriber. In the case of the number “(0231) 4777-227, “227” is the extension number within a telecommunications system. An extension number allows you to dial a specific extension of a telecommunications system directly via this defined number.

E.164

ITU-T standard for global telephone numbering (country code, local area code and subscriber number, e.g.+49 (231) 123456-789.

ENUM

tElephone NUmber Mapping

ENUM is an application of the Domain Name System for converting telephone numbers (in the E.164 format) to Internet addresses. An ENUM registration of a VoIP number allows calls to be placed directly via the Internet, for example.

Ethernet

Network for limited local operation (10 m to 10 km) in the LAN. The individual computers are connected via a cable network. Data is transferred within this network at a rate of 10Mbit/s, 100Mbit/s or 1Gbit/s.

FD

Full Duplex (DX, sometimes also FDX, permits simultaneous transmission of information in both direction, e.g. in telephony).

FTP

File Transfer Protocol (Network protocol for file transmission)

G.711

ITU standard for compression,
here: Audicodec 64 kbit/s

G.722

ITU standard for compression,
here: Audicodec 64 kbit/s

G.723.1

ITU standard for compression,
here: Audiocodec 5.3 kbit/s and 6.3 kbit/s

G.729

ITU standard for compression,
here: Audicodec 8 kbit/s

GAP

Generic Access Protocol
Standard for DECT Handsets, which allows the communication between handsets and basis stations of different manufacturers.

Gateway

A gateway is a system, which connects two different networks and which can transfer the data in one network to the other network and vice versa. This means that the physical networks can be different and the protocols used (e.g. IP network and ISDN) can also be different.

GSM

Global System for Mobile Communication
Global system for mobile communication

H.323

A collection of international specifications (ITU), which define the transmission of multimedia data to packet-oriented data connections.

H.323 Alias Name

A symbolic name (e.g. TOMMY), which can be used as the address of an H.323 terminal instead of an IP address.

H.450

Standard for additional performance specifications in H.323, such as Conference, Call Forwarding, Hold, Call Swap, etc.

HTTP

Hypertext Transfer Protocol. A protocol for transmission of data over a network. It is mainly used for loading websites and other data from the World Wide Web (WWW) into a Web browser.

Hub

A hub creates a network node in a star-shaped LAN and it connects several clients to the network.

ID

Identification

IEEE

Institute of Electrical and Electronics Engineers
International standardization committee

Instant Messaging

Immediate message transfer.
A service that uses the Instant Messenger software (client) to enable real-time communication (chat) with other subscribers. Short text messages are sent using push technology via a network (server) to the recipient (usually via the Internet), who can respond to them immediately. Files can usually also be exchanged by this means. In addition, many messaging programs offer video or telephone conferences.

IPEI

Hardware address (12 digits) of a DECT handset which allows an unique identification.

IP

Internet Protocol

Fundamental protocol of the Internet, which combines packet-oriented networks with different technical bases to one large network.

Thus this protocol (on layer 3 of the OSI layer model) is used for addressing and distributing data into packets.

IP-adress

An IP address is a 32-bit number, which is usually shown as a four-part number, e.g. 192.177.65.4, and which is assigned to every computer connected to the Internet. Domain names, which are unambiguously assigned to IP addresses using a DNS server, were introduced in order to make these addresses simpler and clearer for users.

IP PBX

IP Private Branch Exchange

A telephone private branch exchange (PBX) which is created by a software application. It uses Voice-over-IP (VoIP) technology for voice transmission.

ISDN

Integrated Services Digital Network
Service integrating digital network

ITSP

Internet Telephony Service Provider.

An Internet telephony service provider offers an interface via a gateway between Internet telephony and the classic telephone network. Thus via an ITSP, VoIP users can also reach subscribers in the classic telephone network, and vice versa.

IVR

Interactive Voice Response
Interactive Call handling

LAN

Local Area Network

A local network, which is made up of numerous, interconnected computer terminals within one company location and which is used to transfer data.

LDAP

Lightweight Directory Access Protocol

A network protocol that allows querying and modification of information of a directory service (a distributed hierarchical database in the network). The current version is specified in RFC 4511.

LED

Light Emitting Diode

Light emitting diode (small light) for displaying status information, e.g. for SwyxPhone.

MAC-adress

Medium Access Control Address
Each network card identifies itself with the MAC address. This address is an 8-byte address, which is uniquely defined worldwide.

MAPI

Mail Application Programming Interface

This Microsoft interface can be used by applications to send E-mails.

Multiple connection

Basic Rate Interface for operating up to eight ISDN terminals (ISDN telephones etc.) on a S0 bus. It is possible to operate ISDN telephones, ISDN cards or ISDN telecommunications systems on a multiple connection. The devices are addressed via MSNs.

MSN

Multiple Subscriber Number

A non-direct dialing-in line can have several numbers (MSNs). The assignment of these MSNs to the terminals takes place in the terminals themselves.

Name Resolution

Automatic association of a name to a phone number.

NAT

Network Address Translation is a method for replacing an IP address by another within a data package. This method is frequently used to map private IP addresses to public IP addresses.

NT mode

Network Terminator

For ISDN (and other protocols) a different behavior is often required, depending on functionality. For ISDN, the exchange operates in NT mode and the telephones (terminals) operate in TE mode. An example of different behavior is the transfer of charging information, which is only possible from NT to TE, and not the other way around.

NetBIOS Name

A symbolic name (e.g. WS-SJONES), which is used for addressing a computer, if this computer should be contacted using the Microsoft NetBIOS protocol.

OPUS

Open standard RFC 6716 (.opus)
Dynamically adjustable bit rate. Best audio quality/storage space ratio.

Overlap Sending

The numbers entered are dialed immediately. The destination phone number can no longer be edited. The opposite of this is ‘Block dialing’.

P2P

see Peer-to-Peer

PABX

Private Automatic Branch Exchange
Private branch exchange

PBX

Private Branch Exchange

Controlling device for telephone systems within a small telephone network, including transition to a public telephone network.

PDA

Personal Digital Assistant.
Small portable computer, usually equipped with a quick start operating system, and used along with many other programs mainly for personal calendar, address and task management.

PIN

Personal Identification Number

This number is linked to the user name, and is used for user authentication.

Peer-to-Peer

Network principle in which the data exchange occurs decentrally, directly between the individual computers. In the VoIP field, this means that the connection exists directly between the two subscribers, without server or provider.

POTS

Plain Old Telephony System
This is the classic analog telephone.

Power over LAN

Power over LAN is used to identify a property of devices with Ethernet connection, e.g. IP telephones. Thus, the power supply is provided via the Ethernet connection line and not via a power mains plug, as usual. In this case, the Switch or the Hub to which this device is connected per Ethernet must be able to guarantee the power supply via the Ethernet line.

PSTN

Public Switched Telephone Network

Umbrella term for analog telephone networks, which usually use digital switches.

QoS

Quality of Service

The quality in communication networks. Depending on the standard or protocol, different parameters are used for evaluating the properties, such as loss rate, availability, transfer rate and delay.

Router

A router connects different kinds of networks to each other. It recognizes the bordering networks and neighboring routers and it determines the path of the data packet. This connection can be created by using either a software or a hardware solution.

RSVP

Resource Reservation Protocol

IETF standard to guarantee a certain transmission qualities, such as bandwidth and priority via TCP/IP.

Servers

The workstation computers are connected (e.g. via Ethernet) to the server, which is the “central computer”.

SIP

Session Initiation Protocol

A network protocol which establishes a communication session between two or more subscribers.

Smartphone

A smartphone unites the functional scope of a mobile phone with that of a PDA. You can use a full keypad or touch screen and speak from a PDA phone. Digital cameras are sometimes also incorporated, as in many mobile phones.

SNMP

Simple Network Management Protocol

Network protocol developed by the IETF - an open international voluntary association of network engineers, manufacturers and users, which is responsible for proposals for Internet standardization -, to enable network elements (e.g. routers, servers, switches, printers, computers etc.) to be monitored and controlled from a central station.

SNTP

Simple Network Time Protocol

Standard for synchronizing clocks in computer systems over packet-based communication networks. Although mostly handled via UDP, can also be transported using other layer 4 protocols such as TCP. Specifically developed to enable reliable timing over networks with variable packet propagation time (ping).

Voice Compression

The voice data are compressed and sent via the network. This reduces the amount of data to be transmitted. This is especially important for the Home Office connection and the coupling of several branch offices via the Internet.

STUN

STUN is a simple network protocol that recognizes the existence and type of firewalls and NAT routers and uses this information to bypass them.

Subnet

A network can be divided into several subnets. For example, it is possible to use the IP address 192.177.65.xxx to address all computers, which have the number 192.177.65. in common and which only differ from one another in terms of the last three digits (xxx). The subnet mask indicates which positions should be used for differentiation within the subnet. In a subnet, two subscribers communicate directly with each other. The IP packets only have to pass through the router if subscribers communicate outside of the subnet.

Switch

A Switch is an active hub, which functions as a kind of exchange. In contrast to the hub, the switch does not forward the incoming data packets to all lines, but rather only to that line which leads to the destination of the packet.

TA

Terminal Adapter

TAPI

Terminal Application Programming Interface
Interface for programming terminal applications

TE mode

Terminal Endpoint, see NT mode.

TEI

Terminal Endpoint Identifier

With the help of the TEI, different terminals are addressed to an ISDN bus on Layer 2.

TCP/IP

Transmission Control Protocol / Internet Protocol

Two commonly used protocols for the transfer of data and for Internet connection, which can be implemented on different types of transport media.

TLS

Transport Layer Security

Internet protocol for encrypted data transfer (SSL advancement)

TSP

TAPI Service Provider
Driver for TAPI devices

Unified Messaging

Message management system developed in 1989. It denotes a method of bringing incoming and outgoing messages of any kind (e.g. voice message, email, fax, SMS, MMS, etc) into a standardized form, and granting the user access to this via a wide range of clients (fixed network or mobile phone, email client).

USB

Universal Serial Bus
Bus system for connecting a computer to ancillary equipment. A USB port takes little space, and can supply power to simple devices such as a mouse, a phone or a keyboard. Devices equipped with USB can be connected to each other during active operation (hot plugging), and their properties can be detected automatically.

VLAN

Virtual LAN
Virtual local network within a physical network. A widespread technical implementation of VLANs is partially defined in the standard IEEE 802.1Q.

VoIP

Voice over IP

Collective term for all techniques for transmitting voice over IP networks.

WAP

Wireless Application Protocol
The Wireless Application Protocol denotes a collection of technologies and protocols, whose aim is to make Internet content available for the slower transmission rates and the longer response times in mobile radio, as well as for the small displays of mobile telephones. WAP is thus in direct competition with the i-mode services.

WAV

A file format used for recording voice or music, for example, announcement texts, music on hold, or Voice message. 16KB of memory are required for each recorded second.