11.2.13. Time Synchronization Between the Host System and CC-AP/Survivable OpenScape 4000 SoftGate 
An exact time is required for many OpenScape 4000 functions (call
detail recording, time-dependent channels, night service, etc.). All
clocks in the system (up to 84) have to operate synchronously.
There are two ways of synchronizing the time:
- A time server is available in the IP network, which supports time synchronization of all OpenScape 4000 processors (the central processor and all survivability units) using the Network Time Protocol.
- A time server is not available in the IP network. The OpenScape 4000 platform then makes its local time available over the network for synchronizing all survivability units.
For more information on date/time settings and time synchronisation please
refer to Section 1.11,
“Time Synchronization”.