3.6.1.2. Switchover 
If the connection between CCA/CCB and vNCUI is lost (i.e. between
the host system and OpenScape 4000 SoftGate), the error message "LTUC
OUT OF ATTENDANCE LIST" is generated and the OpenScape 4000 SoftGate
is switched over ("SOFTGATE RECONFIGURATION START") (see AMO HISTA).
The successful switch over of the individual boards is confirmed with
"BOARD RECONFIGURATION OK". The end of the complete switchover is acknowledged
with "SOFTGATE RECONFIGURATION END".
A (5 minute) timer is started when the reconfiguration starts . This
timer is stopped with the message "RECONFIGURATION END". If an END message
has still not been received following expiry of the timer, the message
"SOFTGATE RECONFIGURATION TIME" is issued (AMO HISTA). This can happen
if several OpenScape 4000 SoftGates or a large number of subscribers
have to be switched over and simply serves as additional notification
that the move is still pending.
From the FA perspective, it cannot be established whether an error
has occurred at the application or PC level (error or planned shutdown)
or whether there is an IP network error (no connection to OpenScape 4000
SoftGate - CCA/CCB).
IMPORTANT:
The automatic switchover for failure cases e.g.
cable disconnect/failure or OpenScape 4000 SoftGate outage is performed
only once: from NORMAL to STBYRDY. Regardless of the state of the former
NORMAL SoftGate there will be no further automatic switch back. In other
words, the failure case happened and the automatic switchover was performed
and the fault of the initial SoftGate has been repaired to STBYRDY, then
a manual switchback needs to be executed to make the Automatic Switchover
available again!