Automatic Route Selection (ARS) Feature
Description
Factory-Set Tables
In addition to the fully programmable tables, ARS has four factory-set tables:
- Dial 0 Table � This factory-set table routes calls to numbers that
start with 0. The international dialing code, 011, is treated as a special
case and can be put into a programmable table. If 011 is not specified in
a programmable table, international calls are routed through the Dial 0 Table.
Programming of this table is limited to a single pool, its FRL, and system-prefixed
digits.
- Special Numbers (N11) Table � This factory-set table routes calls
to the special numbers 411, 611, 811, and 911. The main pool is always used.
The pool routing for this table is not programmable.
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CAUTION! |
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Unless networked systems are collocated, each system should have at least
one loop- start line connected to the PSTN. The line is required to allow
connection of a power- failure telephone to the Power-Failure Transfer
(PFT) jack on a module as a power outage backup and for correct routing
of emergency and other N11 calls. To ensure that the correct services
are reached, if the loop-start line is used for emergency or other N11
calls, it should be assigned to the main pool. In this case, IXC calls
determine the number of loop-arts required. See Power-Failure
Transfer for more information.
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- Default Toll Table � This factory-set table routes toll calls to
numbers that do not match entries in any of the area code, 6-digit, or 1 +
7 digits tables. This table has two subpatterns of up to six routes each,
but neither absorbed digits nor system-prefixed digits are used.
- Default Local Table � This factory-set table routes local calls to
numbers that do not match entries in the local exchange tables. This table
has two subpatterns of up to six routes each, but neither absorbed digits
nor system-prefixed digits are used. Routes assigned to the Default Local
Table are factory-set with an FRL of 2.
The system can have up to 20 tables, 16 of which are fully programmable.
The Dial 0, Special Numbers (N11), Default Toll, and Default Local tables
are factory-set and allow limited programming.
Each table (where appropriate) can have two subpatterns (A and B) with an
associated start time. The start time for Subpattern A is specified as the
stop time for Subpattern B. One subpattern or the other is selected, based
on the time of day and the subpattern start time. (If both subpatterns have
00:00 start time, Subpattern A is selected.) Each subpattern can contain up
to six routes, listed in order of preference or cost effectiveness.
In addition, each route has an FRL associated with it. The FRL is used to
refine the route selection process further. Each extension, remote access
barrier code, and remote access default Class of Restriction (COR) is assigned
an FRL from 0 through 6. Each route is also assigned an FRL from 0 through
6. For extensions, 0 is the most restrictive and 6 is the least restrictive
level. For lines/ trunks, 6 is the most restrictive and 0 is the least restrictive
level. An extension can use a route only if its FRL is greater than or equal
to the route�s FRL. Refer to the Network Reference for information on private
network call routing (Hybrid/PBX mode only).
Other digits or special characters may be required so the system can route
a call on a particular pool. For example, some companies use an alternate
toll call carrier that requires dialing the number with Pause characters and
access codes. Each ARS route may have up to 20 characters that are automatically
prefixed when a user dials a number. The allowed characters are the digits
0 through 9, *, and Pause. Refer to the Network Reference for information
on prepended digits for private network calls (Hybrid/PBX mode only).
ARS also provides an absorb (ignore) digit capability for each route. For
example, if the central office does not require a "1" before an
area code, the system can be programmed to ignore that first digit. Up to
11 characters can be automatically absorbed when a user dials a number. For
10-digit toll calls, the prefix 1 must be dialed to signal a toll call to
ARS. If the central office does not require the prefix 1 for toll calls, the
digit absorption feature can be used to eliminate the prefix as the number
is dialed. Initially, all 20 tables are available for the call.
