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A-2 Issue 5 January 1998
Automatic Routing Features
DEFINITY ECS provides a variety of automatic-routing features for public and pri-
vate networks. Automatic Alternate Routing (AAR) and Automatic Route Selection
(ARS) are the foundation for these automatic-routing features. They route calls
based on the preferred (normally the least expensive) route available at the time
the call is placed. Generally, AAR routes calls over a private network and ARS
routes calls using the public network numbering plan. However, both AAR and
ARS support public and private networks. You can use the other features listed in
this section when you use AAR and ARS.
Automatic Alternate Routing (AAR)
Allows private network calls to originate and terminate at one or many locations
without accessing the public network. When you dial an access code and phone
number, AAR selects the most desirable route for the call and performs digit con-
version as necessary. If the first choice route is unavailable, another route is cho-
sen automatically.
The numbers you call using AAR are normally private-network numbers.
However, you can call a public-network number, a service code, an international
number, operator access code, or an operator-assisted dialing number. With
AAR and Subnet Trunking, you have a convenient way to place international calls
to frequently-called foreign cities. Such calls route as far as possible over the
private network, and then access the public network. This saves toll charges and
allows you to use your private network as much as possible.
Automatic Route Selection (ARS)
ARS selects carriers automatically and routes calls inexpensively over the public
network. When there are one or more long-distance carriers and wide-area tele-
communications services (WATS) provided, DEFINITY ECS selects the most pre-
ferred route for the call. Long-distance carrier-code dialing is not required on
routes selected by the system. You assign long-distance carrier-codes and
DEFINITY ECS translates them. The system inserts codes as needed to guaran-
tee automatic-carrier selection. ARS can route calls to a variety of types-of-num-
bers and access a variety of types of trunk groups.
AAR/ARS Overlap Sending
DEFINITY ECS supports overlap sending for AAR and ARS calls that are routed
over ISDN-PRI trunk groups. ISDN-PRI call-address information is sent one digit
at a time instead of in one block. In countries with complex public-network num-
bering plans, this allows for a significant decrease in call setup time. When over-
lap receiving is enabled, this is especially significant for tandemed calls.