AMT/PTD/TR/0001/3/7/EN
Installation Manual for digital sets - IP sets - SIP sets
Page
10-24 05/2008
Aastra Phone 312
Auto
: with this setting, the device tries to use U-APSD mode when the AP indicates to it
that it supports it. If the AP does not support U-APSD mode, Aastra Phone 312 uses the
asynchronous PS-Poll mode.
You can know whether U-APSD mode is supported in the Site survey window. If voice
communication is cut too often, it is better to use another power saving mode, or even
none.
U-APSD
: U-APSD (Unscheduled Automatic Power Save Delivery) mode is defined in
standard 802.11e. It optimises both the storage battery autonomy and voice quality. If this
mode is selected in the WLAN profile whereas it is not supported by the AP, Aastra
Phone 312 does not use any ouwer saving mode.
Asynchronous PS-Poll
: This mode uses PS-Poll packets defined in standard 802.11 to
route voice packets from the access point. However, contrary to the provisions of the
standard, PS-Poll packets are not only used after low-power beacons; they are also
used asynchronously. With this system, with equal voice quality, storage battery
autonomy is almost the same as in U-APSD mode. This mode is not supported by all
access points. If voice communication is cut too often, it is better to use another power
saving mode, or even none.
802.11 PS-Poll
: This mechanism was initially defined in standard 802.11. Its major
inconvenience is that it delays a big part of the packets. This delay corresponds to the
low-power beacon interval, and voice quality is affected by this. Nevertheless, this mode
may be useful when no other power saving mode is supported by the access point but a
long conversation time is required.
None
(power saving mode): no power-saving mode is used. The storage battery
autonomy is reduced by at least half for voice communications. This option may be used
when the access point is not compatible with any other power saving mode. Unlike the
others, this option deactivates the search for access points in the background, since it is
assigned to a power saving mode. Call transfer operations also work less properly.
IP Address
: Using the left function key
, select the possibility you want from the
list of possibilities. Press the arrow key to access the other entries. If, in place of setting
through DHCP, you have selected static, you must make inputs for the IP address,
network mask, gateway and DNS server. To separate the blocks, enter the necessary
points using the hash key.
NTP server
: While assigning the IP address selected by DHCP, you can equally set the
NTP server manually. The manually set NTP server address has priority over the NTP
server address received via the DHCP server.
DSCP/TdS
: This option is used to define the service type byte value (RFC 791) in the IP
header. This value must be entered in decimal format. It is inserted in all SIP packets
and in all outbound voice packets.
Instead of the service type byte, it is also possible to indicate a DSCP (Differentiated
Services Code Point) value, defined by standard RFC 2474. DiffServ uses the first 6
service type bytes.
As DSCP and TdS systems use the same bytes in the IP header, you must wait for them
to be used in the network components to know if the value must be interpreted as DSCP
or TdS type.
10.6.1.4 After configuration
After configuration
A created profile is automatically selected as active. If the network is in an area that is covered, the
signal reception intensity bars are displayed after a few seconds. If during the assignment of IP
