Operation Manual

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LANCOM Advanced VoIP Client
 Technical Terms
PDA Personal Digital Assistant. Small portable computer, usually equip-
ped with a quick start operating system, and used along with many
other programs mainly for personal calendar, address and task
management.
PIN Personal Identification Number
This number is linked to the user name, and is used for user authen-
tication.
Peer-to-Peer Network principle in which the data exchange occurs decentrally,
directly between the individual computers. In the VoIP field, this
means that the connection exists directly between the two subscri-
bers, without server or provider.
POTS Plain Old Telephony System
This is the classic analog telephone.
Power over LAN Power over LAN is used to identify a property of devices with Ether-
net connection, e.g. IP telephones. Thus, the power supply is provi-
ded via the Ethernet connection line and not via a power mains plug,
as usual. In this case, the Switch or the Hub to which this device is
connected per Ethernet must be able to guarantee the power supply
via the Ethernet line.
PSTN Public Switched Telephone Network
Umbrella term for analog telephone networks, which usually use
digital switches.
QoS Quality of Service
The quality in communication networks. Depending on the standard
or protocol, different parameters are used for evaluating the proper-
ties, such as loss rate, availability, transfer rate and delay.
Router A router connects different kinds of networks to each other. It recog-
nizes the bordering networks and neighboring routers and it deter-
mines the path of the data packet. This connection can be created by
using either a software or a hardware solution.
RSVP Resource Reservation Protocol
IETF standard to guarantee a certain transmission qualities, such as
bandwidth and priority via TCP/IP.
Server The workstation computers are connected (e.g. via Ethernet) to the
server, which is the “central computer”.
SIP Session Initiation Protocol
A network protocol which establishes a communication session
between two or more subscribers.
Smartphone A smartphone unites the functional scope of a mobile phone with
that of a PDA. You can use a full keypad or touchscreen and speak
from a PDA phone. Digital cameras are sometimes also incorporated,
as in many mobile phones.
Term Explanation