elmeg IP120 / en / elmegIP120_v1 / web_configurator.fm / 01.08.2012
V
e
rsion 2, 27.0
5
.2010
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elmeg IP120
Teldat
Configuring phone settings via the Web configurator
Call Manager
Select whether you want to accept calls that are transferred via the Call Manager of the phone
system, directly. You have the following options:
– via Headset
–
via Handsfree
or
– not at all (
No
)
Saving settings
¤
Click on
Save
to save your settings on the
Server and Phone Systems
screen.
QoS settings (Quality of Service)
On this screen you can optimise the voice quality of your IP telephone.
The voice quality depends on the priority of the voice data in the IP network. Prioritising the
VoIP data packets is done using the QoS protocol DiffServ (Differentiated Services). DiffServ
defines a number of classes for the quality of service and, within these classes, various priority
levels for which specific prioritisation procedures are defined.
You can specify different QoS values for SIP and RTP packets. SIP packets (Session Initiation Pro-
tocol) contain the signalling data, while RTP (Real-time Transport Protocol) is used for the voice
transfer.
Settings
¢
Network and Connections
¢
QoS Settings
¤
Enter your chosen QoS values in the
SIP ToS/Diffserv (0..63)
and
RTP ToS/Diffserv (0..63)
fields. Value range: 0 - 63.
Common values for VoIP (default setting):
SIP
34
High service class for fast switching of the data flow
(Expedited Flow)
RTP
46
Highest service class for fast forwarding of data packets (Expedited For-
warding)
Warning
Do not change these values without consulting your network operator first. A higher value
does not necessarily mean a higher priority. The value determines the service class, not the
priority. The prioritisation procedure used in each case meets the requirements of the class
and is not necessarily suitable for transferring voice data.
Detailed information on the Diffserv protocol can be found in RFC 2474 and RFC 3168.
