Performance Optimisation - Gigaset SL75 WLAN User Manual

Performance optimisation

Despite entering a STUN server, voice
connections are one-sided or there are
problems with registration or you are not
accessible.
¤
Enable the SIP and RTP ports on your
router (e.g. with port forwarding).
If this does not help, the above-mentioned
case might involve an infrastructure with a
symmetric NAT. STUN servers, however,
can only be used with asymmetric NATs
and not blocking firewalls.
¤
Use an outbound proxy instead of the
STUN server.
Please ask your provider if they use such
an outbound proxy server.
Performance optimisation
The performance of your WLAN handset is
also dependent on the properties of the
infrastructure as a whole.
The following may impact performance:
u
Wireless ADSL router
u
DSLAM
u
DSL transmission path
u
Connection paths over the Internet
Performance includes, amongst other
things, voice quality, power consumption
and range.
Voice quality
In VoIP networks, voice quality is affected
by " Quality of Service" (QoS, page 90) etc.
If the entire infrastructure demonstrates
QoS, voice quality is better (fewer delays,
less echoing, less crackling etc.).
If, for example, the wireless access point/
router does not demonstrate QoS, voice
quality is poorer as a result. QoS includes,
for example, TOS (Type of Service),
802.11e etc. Please see the specialist
documentation for further information.
114
Power consumption
Long standby and talk times can be
achieved if, for example, the WLAN router/
access point already boasts the WMM
(Wi-Fi Multimedia) feature and you are
able to change the DTIM value on the
router/access point (value 5 is recom-
mended, for example). WMM primarily
influences the talk time, changeable DTIM
values mainly affect the standby time.
If an access point does not support WMM
and changeable DTIM values, the standby
and talk times can be more than halved. In
addition, the handset can become warm
around the display. We therefore recom-
mend an access point that supports the
features mentioned above.
Please refer to the device manufacturer's
user guide or Web pages and/or find out
about software updates for the access
points.
Other factors that can affect standby and
talk times include:
u
The field strength where the handset is
located
The further away the handset is from
the WLAN router/access point, the
shorter the standby and talk times.
The handset discharges particularly
quickly if it is outside the range of the
WLAN router/access point for a lengthy
period of time, i.e. it has practically
ceased to be "registered" on the WLAN
router/access point.
u
Display illumination (page 69)
The more frequently the display is
activated, e.g. when making directory
entries, and the longer the periods of
activation, the shorter the standby
time.
u
Vibrating alarm (page 70)
The standby and talk times are reduced
if the vibrating alarm is activated.
TM