S-COM 7K, Руководство пользователя, Страница: 132 / 400

7K • Chapter 7
7-38
Autopatch Restrictions
A feature of the autopatch is the ability to restrict calls to certain groups of
telephone numbers. This is done by building two tables in the controller’s
memory:
• An Accepted Number Table .
• A Rejected Number Table.
Note: Since these tables are only resident in memory, neither appear in this
manual. Programmers of the repeater may wish to keep a notebook of
accepted and rejected numbers.
Each time an autopatch call is placed, the telephone number is compared to
both tables. A decision is then made to allow—or not allow—the call to go
through.
Both the Accepted and Rejected Number Tables may contain specific
telephone numbers, or telephone numbers with “wild card” characters. This
feature allows
groups of accepted or rejected numbers to be compared to the
number being dialed.
Uses of Autopatch Restrictions
There are many uses for autopatch restrictions:
•
Certain troublesome numbers can be placed in the Rejected Number Table
using the command on page 7-42, and will not be dialed by either entering
the number via command or via macros.
•
Commercial phone numbers could be restricted and “hints” could be made
to unpaid members.
•
In major cities, it is possible to place a long-distance call to another
exchange by dialing a simple 7-digit number. To prevent the repeater phone
line from accumulating monthly long-distance charges, simply place the
local exchange numbers in the
Accepted Number Table . Program the
Select Autopatch Call Types for only accepted numbers. (See page 7-36.)
•
In some areas, important numbers (such as police or ambulance) require a
long-distance call. Since the owner may not want to open the repeater to all
long-distance calls, he may simply program those few important numbers
into the
Accepted Number Table . Other long-distance calls will not be
permitted if the Autopatch Call Types Table does not include them. (See
Autopatch Call Types section on page 7-35 and the Select Autopatch Call
Types command on page 7-36.)
•
Since the Autopatch Call Types Table does not include all types of calls
which might exist, the autopatch restrictions feature may be used again. For
example, some areas of the county have 911 emergency service. The