Siemens Gigaset C470 IP User Manual page 175

Glossary
D
DHCP
Dynamic Host Configuration Protocol
Internet protocol that handles the automatic assignment of IP addresses to Network
subscribers. The protocol is made available in the network by a server. A DHCP server
can be a router for example.
The phone contains a DHCP client. A router that contains a DHCP server can assign the
IP addresses for the phone automatically from a defined address block. The dynamic
assignment means that several Network subscribers can share one IP address,
although they use it alternately and not simultaneously.
With some routers you can specify that the IP address for the phone is never changed.
Displayed name
VoIP provider feature. You can specify any name that is to be shown to the other party
during a call instead of your phone number.
DMZ (Demilitarised Zone)
DMZ describes a part of a network that is outside the firewall.
A DMZ is set up, as it were, between a network you want to protect (e.g. a LAN) and a
non-secure network (e.g. the Internet). A DMZ permits unrestricted access from the
Internet to only one or a few network components, while the other network compo-
nents remain secure behind the firewall.
DNS
Domain Name System
Hierarchical system that permits the assignment of IP addresses to Domain names that
are easier to note. This assignment has to be managed by a local DNS server in each
(W)LAN. The local DNS server determines the IP address, if necessary by enquiring about
superordinate DNS servers and other local DNS servers on the Internet.
You can specify the IP address of the primary/secondary DNS server.
See also: DynDNS.
Domain name
Name of one (of several) Web server on the Internet (e.g. Siemens Home) The domain
name is assigned to the relevant IP address by DNS.
DSCP
Differentiated Service Code Point
See Quality of Service (QoS).
DSL
Digital Subscriber Line
Data transfer technology that allows Internet access with, for e.g., 1.5 Mbps over a con-
ventional telephone line. Preconditions: DSL modem and the appropriate service
offered by the Internet provider.
DSLAM
Digital Subscriber Line Access Multiplexer
The DSLAM is a switch cabinet in an exchange at which all subscriber connectors con-
verge.
DTMF
Dual Tone Multi-Frequency
Another description for dual tone multi-frequency dialling.
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