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4-94
Toll Restriction
Description
DHS
The
range of digits dialed on a CO line does not correlate with the Allow Digit Interval table,
the CO line is released immediately. On any non-allowed call, the station user will receive
error tone and the CO line button LED will extinguish. At an Executive Key Telephone, the
user will see Call Restricted on the LCD. The Toll Restriction Allow Digit Interval table may
be constructed in a matrix format and associated to any of the COS. Stations may be
assigned a separate COS for Day System Mode operation and Night System Mode
operation.
Tone Detector
The system provides one shared tone detector which is used for certain features to detect
the call status of the CO line call in progress. Those features which use the tone detector
include DISA, External Call Forward, Last Number Redial and Save Dialed Number,
Automatic Busy Redial and Dial Tone Detection.
The logical rules for sharing the tone detector are described below:
Only one station is allowed to wait for the tone detector to become available.
When the tone detector is currently assigned to a station, the maximum allowed time
to wait for CO dial tone is 6 seconds (default).
If no CO dial tone is detected within 6 seconds, the tone detector will be returned to
idle, or assigned to another waiting station. The telephone number, if entered, will
then be dialed.
In the unlikely event that more than one station requests a tone detector at exactly
the same moment, those stations will hear internal busy tone immediately, although
a tone detector may be available.
Tone/Inter-Digit Duration
Description
Depending on the type of CO, and the customer specialized dialing requirements, the
DTMF ON time and INTER-DIGIT time may be modified for manually-dialed or system
automatically-dialed digits. Typically, no modification of tone/inter-digit duration is
required. However, in some installations where line conditions are poor, tone duration
and/or inter-digit duration timing may be increased to offset poor conditions. Tone
duration and inter-digit duration may be assigned any value (50 to 150 ms).
provides sophisticated monitoring of digits dialed on CO lines. If a digit or
The DHS requires the Option Module to support this capability.
Toll Restriction
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