2.17.2.2. Cluster 
The location of endpoints in the network is determined by their membership
of a sector. To simplify the administration the endpoints (devices, trunks)
that have the same accessibility are combined in a so called cluster.
A cluster can contain:
- all HFA devices in the OpenScape 4000 system
- all HFA devices in one access point
Figure 35. Sector /cluster definition in one OpenScape 4000 node (example)
HFA terminals can be assigned to different clusters even though they are configured
on the same board.This is the case when the terminals are connected to different
local area network/WAN sectors.