5.16.7.2. Service Information 
- The numbers of a closed numbering network must be unique.
- Closed numbering is used within Areas (so-called OpenScape 4000 Domains).
- The WABE entries in such a network (Area) must be consistent, i.e. entries for call numbers must lead to the corresponding destination number.
- Virtual node numbering structure in the case of closed numbering networks is not sensible in the I.M.
- With the help of the AMO WABE, the physical destination node number can be displayed.
- NWLCR is the typical OpenScape 4000 numbering with NPI=unknown, which
is primarily used for the internal company area
Figure 30. Call Setup Procedure via Networking LCR
