2N Omega series - Configuration Tool manual v1.10 - Manual (Page 85)

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2.10.2. External lines
2.10.2.1. Making accessible
The table has as many columns as there are internal subscribers and as many
rows as there are external lines. Thus at intersections it is possible to tick or end an
internal subscriber‟s access to each external line.
2.10.2.2. Tariff credit and Blocking
The item Prepaid serves for assigning the maximum number of 16 kHz
impulses received. When the assigned number is reached the call automatically
ends. A new call cannot be made through this external line. Credit must be topped
up through a programme.
The item Blocking enables an external line to be blocked for example during a
breakdown.