11.2. Configuring the APE Feature (Access Point Emergency) 
To configure the AP Emergency feature, you must have a good understanding
of the functioning of this feature. This overview is found in Chapter 1,
“Access Point Emergency Feature Description”
IMPORTANT:
For emergency mode, configuration of the feature
“Alternate Routing on Error“ is mostly required so that subscribers
of different “emergency islands“ can contact one another. This is
described in the service manual „Section 3 - Feature Usage Examples
> Alternate Routing on Error“. In some installations trunk and tie-line
circuits have to be configured in order to access a HiPath 400/OpenScape
4000 network or the public network from the “islands“. Conclude this
part of the configuration before configuring the AP Emergency
feature. You can prevent APE from taking effect if a fault occurs in
the network for example. If, however, the above requirements have not
been fulfilled, the communication capability of an “emergency island“
may be restricted and it may no longer be possible to make emergency
calls.
The feature configuration is divided into the following steps:
- Activities on OpenScape 4000 host system
- Configuring or Modifying a CC-AP/Survivable OpenScape 4000 SoftGate in OpenScape 4000
- Configuring or Modifying an Emergency Group
- Configuring Access Points/OpenScape 4000 SoftGates for AP Emergency
- Configuring the Display for AP Emergency on the Terminal
- Defining the Switchover Delay
- Time Synchronization Between the Host System and CC-AP/Survivable OpenScape 4000 SoftGate
- Activities on the survivability unit - CC-AP/Survivable OpenScape 4000 SoftGate