AASTRA 4422 IP Office for MD Evolution User Guide User Manual
Page 113
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MD Evolution – Dialog 4422 IP Office
Attendant-Based Services
Notes:
Certain extensions (such as yours) may possibly be equipped
with permanent protection against call intrusion.
Depending on the configuration for your facility defined by
your system administrator, these services may be used
from specific extensions that are duly authorised, without
any warning tones being emitted. This refers to the Silent
call monitoring service.
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