AASTRA SIP-DECT (Release 1.8)-Installation- and Administration Guide EN - Manual (Page 75)

Installation, Administration and Maintenance
Aastra depl-0900/0.4 Page: 75 (104)
6 Download Over Air
The Download Over Air feature allows updating the handset firmware without
any user interaction or interruption of the telephony services over the existing
DECT air interface.
This features is currently available for the handset types 610d, 620d and
630d.
6.1 How Download Over Air works
If the Download over Air feature is activated, the OMM is acting as a
download server which provides the firmware for downloads.
The PP send it’s actual firmware version within the DECT attachment
procedure. If the firmware version doesn’t match the version provided by the
OMM the PP will be queued into the update-queue.
Later on the queued PPs will be paged to establish a download connection.
After the connection is established the OMM sends its actual PP firmware
version and the PP will request a handset description file. After receiving the
handset description file the PP decides, which files are missing or need to be
updated.
If files are missing or need to be updated the PP initiate the download
procedure.
The OMM takes care of the following download scenarios automatically.
• If a handsets becomes unreachable e.g. when the handset is switched
off, the OMM will update the handset when the PP becomes available
again.
• The OMM will take care of the software download while the user is
moving between base stations (roaming) and location areas.
• The OMM has the capability of resuming a download from the point
where it was last disrupted. e.g. the user goes out of coverage area
during download or the handset runs out of battery power.
• The OMM updates new handsets subscribed to the system.
• While the handset is barred ( e.g. low battery or Dwnload over Air is
disabled at the local menu) the download will be postponed.
The download happens without any user intervention. During the download,
the telephony services, the roaming- and handover procedures are still
available. The download stops automatically when e. g. the PP leaves the
coverage area or the RFP gets busy. The download resumes automatically
when the stop cause is solved.
The 610d / 620d / 630d handsets have two partitions in the internal flash
memory to hold 2 different software versions. During the download the new
firmware is written to one partition and the PP is running from the other
partition.
The new firmware will not be activated until