3
Using the phone
Overview and basic information
General
With the Aastra 312w calls are made over the Internet (VoIP - Voice over Internet Protocol). Access
is gained via access points (APs) of a WLAN (Wireless Local Area Network). The handset itself uses
the SIP standard (Session Initiation Protocol), so that the connections must be made via an SIP serv-
er or an SIP compatible phone system, which also supports this protocol.
The following requirements are valid for the WLAN APs:
• Radio network standard IEEE 802.11g (strongly recommended) or IEEE 802.11b
• Encryption WPA2 (recommended), WPA1 and WEP and unencrypted operation are supported.
• For WPA, an authentication by PSK (pre-shared key) is supported.
• The APs must support and have activated WME (Wireless Media Extensions), also known as WMM
(Wi-Fi Multimedia) (otherwise the battery life during conversations will be considerably shorter
and the speech quality will be reduced).
Familiarize yourself with the configuration of your phone. You will get to know lots of new func-
tions, which will make communication and organization easier for you.
Please note: The handset is not suitable for use in private or public WLAN access points (hotspots).
Details regarding standby and talk times
The battery energy consumption strongly depends on the characteristic of the access points (APs)
used. Please make sure that the AP supports the WMM (Wi-Fi multimedia) feature (also known as
WME or 802.11e) as well as ADSD (Asynchronous Power Save Delivery). Moreover, you should be
able to set the Delivery Traffic Indicator MAP (DTIM). The talk time of the handset is optimised by
WMM, and the standby time by DTIM. A DTIM setting of 5 is recommended. In nets with very high
broadcast loads, it may also be reasonable to select smaller values which will, however, reduce the
standby time.
Networks with high broadcast loads (e.g. in the region of 5 packages per second or more) generally
cause worse standby times as each of these packages must be received and analysed by all WLAN
devices. The reasons for this load are mostly ARP enquiries that are sent to the WLAN without having
been filtered. In large nets, a separation on a higher network layer is thus recommendable, e.g. by IP
routing. Thus, you can also increase the data throughput and the battery life-span of other WLAN
devices.
If these features are not supported, the battery life-span can be more than halved. Settings for the
power saving mode of the handset can be found at the entries for the WLAN profiles.
Moreover, a bad radio connection (great distance to the AP) reduces the standby and talk time of
the handset. High speaker or ring tone volumes, a key and display illumination that is switched on
Summary of Contents for 312w
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