Siemens Gigaset S685 IP User Manual page 162

The choice of codec is a compromise
between voice quality, transmission
speed and the necessary bandwidth.
A high level of compression, for exam-
ple, means that the bandwidth
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.
COLP / COLR
Connected Line Identification Presentation/
Restriction
Service characteristic of a VoIP connec-
tion for outgoing calls.
COLP displays the phone number
accepting the call on the calling party's
display unit.
The number of the party accepting the
call is different to the dialled number,
e.g. if the call is forwarded or trans-
ferred.
The called party can use COLR (Con-
nected Line Identification Restriction)
to prevent the number from appearing
on the calling party's display.
Consultation call
You are on a call. With a consultation
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 then this
was a consultation 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 that handles the auto-
matic 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 unre-
stricted access from the Internet to only
one or a few network components,
while the other network components
remain secure behind the firewall.
Glossary
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