Toll Restriction; Leading Digits; Carrier Codes - Talkswitch CT.TS005.003902 User Manual

Toll restriction

Toll restriction blocks outgoing calls based on the leading digits. For
example, toll restriction can block calls to inappropriate or premium rate
services.

Leading digits

The leading digits are the first numbers dialed when placing a telephone call.
The leading digits could be an international access code, country code,
national code, STD code, area code, leading digits of premium rate service
codes, or phone number.
The leading digits used in each country are subject to the national
numbering plan. Your telephone directory will provide information on the
numbers used.
Calls with leading digits that do not match the entries in the ARS table will
be routed to the line hunt group originally dialed by the caller.
ARS and toll restriction act on the longest leading digits entry matching the
dialed number. For example, an entry in the ARS table blocks numbers with
leading digit "1" to prevent long-distance calls. However a second entry
routes numbers with leading digits "1800" through a line hunt group
because they are toll-free. Because the second entry (1800) is longer than
the first entry (1), the second entry has precedence. Therefore a call with
leading digits "1800" is routed, even though leading digit "1" would
otherwise cause it to be blocked. This technique can reduce the number of
entries required in the ARS table; and can be used to restrict calls to all but
specific area codes or countries.
• Leading digits can be 1–11 numbers in length.
• Leading digits can include numbers 0–9.
• The leading digits exclude the line hunt group number dialed by the user.

Carrier codes

A carrier code is prefixed to the phone number dialed by the user. It tells the
telephone line service provider to route the call to an alternative carrier. For
example, the carrier code could be a calling card number and PIN number.
ARS determines the carrier code based on the leading digits and the time of
day.
• Carrier codes can be up to 1–24 characters in length.
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