Operation Manual

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LANCOM Advanced VoIP Client
 Technical Terms
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 PC.
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
Instead of permanently assigning an IP address to a computer in a
LAN, DHCP makes it possible to assign IP addresses dynamically and
variably. Applications, which depend on an IP address, are immedia-
tely assigned one upon request.
DDI Direct Dial In
DDI refers to the direct dial from a telephone network to a subscri-
ber. 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 struc-
tures.
DNS Domain Name Server
A server, which translates the symbolic name (e.g. www.micro-
soft.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 “[phone],
“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. [phone].
Term Explanation