Siemens Gigaset S450 IP User Manual page 124

required for each voice connection is
low. However, it also means that the
time needed to compress/decompress
the data is greater, which increases
execution time for data in the network
and thus impairs voice quality. The time
required increases the delay between
the sender speaking and the recipient
hearing what has been said.
Consultation call
You are making a call. With a consulta-
tion call, you interrupt the conversation
briefly to establish a connection to
another participant. If you terminate
the connection to this participant
immediately, then this was an enquiry
call. If you switch to and fro between
the first and second participants, it is
called Toggling.
D
DHCP
Dynamic Host Configuration Protocol
Internet protocol which 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 e.g. be a
router.
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. This 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 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 compo-
nents, while the other network compo-
nents remain secure behind the fire-
wall.
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 of
superordinate DNS servers and other
local DNS servers in 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 rele-
vant IP address by DNS.
DSCP
Differentiated Service Code Point
See Quality of Service (QoS).
DSL
Digital Subscriber Line
Data transfer technology which allows
Internet access at e.g. 1.5 Mbps over
conventional phone lines. Require-
ments: DSL modem and the appropri-
ate service offered by the Internet pro-
vider.
DSLAM
Digital Subscriber Line Access Multiplexer
The DSLAM is a switch cabinet in an
exchange at which all subscriber con-
nectors converge.
Glossary
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