11.5.1. Feature Description 
The system renders a range of night switching options available, which
can be administrated in the system and are identifiable through their
option number. Is is possible to assign one attendant group (ATNDGR)
to as many as eight of these night switching options (NOPTNOs) respectively.
Which of these night switching options handles the representation of
the ATNDGR in the night service can then be specified on an individual
basis at an attendant console (ATND) of the ATNDGR. In night service,
the attendant group (ATNDGR) can be represented by a night switching
option (NOPT). All calls to the attendant group (ATNDGR) are signalled
at a free station assigned to this night switching option. The assignment
of the stations (STN) to the night switching options can be administrated
in the system (AMO NAVAR).
- Universal Answering Options of this nature comprise precisely one station, which is configured especially for "Universal Answering".
- Station Option Options of this nature comprise up to 10 configured extensions. (Seizure takes place in cyclic form.)
- Internal Centralized ATNDGR Option An option of this nature comprises a centralized ATNDGR within the switch and is identified via its ATND group number. An internal centralized ATNDGR can only be assigned to one night switching option. However, this centralized ATNDGR need not yet be configured in an attendant group, i.e. the existence of the ATNDGR is not checked.
- External Centralized ATNDGR Option An option of this nature comprises a ATND group within the network and is identified via the code for the centralized ATND service and the destination number of the switch. An external centralized ATND service can only be assigned to one night option. However, neither the station access code nor the destination number need be configured.