| Exchange
control functions |
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| n | Maintenance
functions |
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| n | supervision of
subscriber lines and trunk circuits |
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| n | Operational
functions |
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| n | administrative data as |
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| n | subscriber
database |
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| n | routing database |
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| n | statistical data as |
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| n | from where and
whom subscribers call |
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| n | holding times
for different equipment types |
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| n | utilization of
IN services |
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| n | User
services |
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| Sample of
IN services |