5.1.1. General Information 
In this case, networking means interconnecting systems with different
network structures, such as
- several OpenScape 4000/HiPath 4000 systems with another or with old systems via S0/S2 lines,
or
- virtual networking of several OpenScape 4000/HiPath 4000 systems with one another or with old systems via carrier.
Networking can use either closed or open numbering (see Chapter 36,
"LCR (Least Cost Routing)").
Heterogeneous networking, which is networking with systems from other
manufacturers, is also possible.
Note that in the case of network nodes without attendant console,
you must configure one console group with a night switch option as "station".
This does not require any hardware (see Chapter
153, "Attendant Console").