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DTMF
Dual Tone Multi-Frequency
Another description for dual tone multi-frequency dialling.
Dynamic IP address
A dynamic IP address is assigned to a network component automatically via DHCP. The
dynamic IP address for a network component can change every time it registers or at
certain time intervals.
See also: Static IP address
DynDNS
Dynamic DNS
Domain names and IP addresses are realised via DNS. For Dynamic IP addresses this
service is now enhanced with "Dynamic DNS" (DynDNS). This permits the use of a net-
work component with a dynamic IP address as a Server on the Internet. DynDNS
ensures that a service can always be addressed on the Internet under the same Domain
name irrespective of the current IP address.
E
ECT
Explicit Call Transfer
Participant A calls participant B. He puts the connection on hold and calls participant C.
Rather than connect everyone in a three-party conference, A now transfers participant
B to C and hangs up.
EEPROM
Electrically Eraseable Programmable Read Only Memory
Memory building block in your phone with fixed data (e.g. default and customised set-
tings) and data saved automatically (e.g. entries to the list of callers).
Ethernet network
Wired LAN.
F
Firewall
You can use a firewall to protect your network against unauthorised external access.
This involves combining various measures and technologies (hard and/or software) to
control the flow of data between a private network you wish to protect and an unpro-
tected network (e.g. the Internet).
See also: NAT.
Firmware
Device software in which basic information is saved for the functioning of a device.
A new version of the firmware can be loaded into the device's memory (firmware
update) to correct errors or update the device software.
Flat rate
Billing system for an Internet connection. The Internet provider charges a set monthly
fee. There are no additional charges for the duration of the connection or number of
connections.
Glossary
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