2-14
Chapter 2
Programming Procedures
TOLL RESTRICTION (CALL BARRING)
OVERVIEW
DCS-816 allows each station to be assigned a class of service (COS) for use in the day mode and a COS for
use in the night mode. This COS determines the station’s dialling class, which can be set to A through H.
Class A has no general restrictions and is not configurable but it will follow the restrictions set in the Class
of Service table (see MMC 701) and Class H is restricted to internal calls only.
Classes B, C, D, E, F and G are controlled by the entries listed in the deny table in MMC 702, the allow
table in MMC 703 and the wild cards defined in MMC 704.
Toll Restriction (Call Barring) Rules
1. The deny entries prevent certain numbers from being dialled. The allow entries are the only exceptions
to these deny entries.
2. Listing numbers in the allow tables without any entries in the deny tables is the same as having no
restriction.
3. When changing any entry or BCDEFG status, you must enter all digits.
The system has a Wild Card facility, these wildcards consists of three characters (X, Y or Z), these
characters can be set to equal all DTMF digit from 1~9, 0, ✱ and #.
The following examples are provided as an aid to help understand how to use the deny and allow tables.
Example
Customer requirements:
z Phones with dialling class B can only dial local calls (i.e. cannot dial any
number starting with 0)
z
Classes C and D are restricted (denied) from dialling 0860 and 0850 numbers.
z
Classes E and F are restricted from dialling 0891 and 0898 numbers
.
z
Class G can dial any number.
z
All classes except B can dial 192
z
All classes can dial 999 calls.
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