AASTRA SIP-DECT (Release 1.8)-Installation- and Administration Guide EN - Manual (Page 74)

Installation, Administration and Maintenance
Aastra depl-0900/0.4 Page: 74 (104)
In any case, when both OMMs’ get in contact again with each other, the
longer running one becomes the active one and that will overwrite the
database file in the standby OMM. Configurations made in this becoming
standby OMM would be lost!
5.6.2.1 Two DECT Air Interfaces
In case of both OMMs’ are in an unsynchronized and active state they are
fully working. RFPs’ which lose connection to the OMM because of the
network break down might connect to the other OMM. Two DECT air
interface will be present but are working parallel.
Note: Both air interfaces are using the same PARK. So it can not determined
to which OMM a location registration succeeds.
For PPs’ different situations are possible:
-
They do not notice this situation
o active calls stay established, depending on network conditions
o PPs’ can make and receive new calls, depending on an
available PBX connection
o PPs’ can do hand over to RFPs’ connected to the same OMM
o PPs’ can call PPs’ that are registered to the other OMM
-
They lose their RFP base station and perform a new location
registration
o active calls are broken
o PPs’ can make and receive new calls, depending on an
available PBX connection
o PPs’ can do hand over to RFPs’ connected to the same OMM
o PPs’ can call PPs’ that are registered to the other OMM
-
They lose their RFP base station and search the DECT network
without finding another one
o active calls are broken
o PPs’ stay in searching for network until an air interface is
available again
Note: Hand over between PPs’ located to RFPs’ which are controlled by
different OMMs’ is not possible.
When the OMMs’ get in contact again with each other this inconsistent
OpenMobility system situation will end.