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DEFINITY Enterprise Communications Server Release 8.2
Overview
555-233-002
Issue 1
April 2000
System Management Features
85
Automatic Routing Features
Automatic Transmission Measurement System
Measures voice and data trunk facilities for satisfactory transmission performance. The
measurement report contains data on trunk signal loss, noise, signaling return loss, and
echo return loss. Acceptable performance, the scheduling of tests, and report contents
are administrable.
Automatic Routing Features
DEFINITY ECS provides a variety of automatic-routing features for public and private
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 conversion as necessary. If
the first choice route is unavailable, another route is chosen 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 Telecommunications
Services (WATS) provided, DEFINITY ECS selects the most preferred route for the call.
Long-distance carrier-code dialing is not required on routes selected by the system. You
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