Instruction manual

Networking and connectivity
555-233-767160 Issue 4 May 2003
Call routing
Alternate facility restriction levels
Allows Communication Manager to adjust facility restriction levels or
authorization codes for lines or trunks. Each line or trunk is normally assigned a
facility restriction level. With this feature, Alternate Facility Restriction Levels
are also assigned. Attendants can change to the alternates, thus changing access to
lines and trunks. You might want to use this feature to disable most long-distance
calling at night, for example, to prevent unauthorized staff from making
long-distance calls.
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CAUTION:
This feature may change the AAR and ARS routing preferences. Using it on
tandem and tie-trunk applications affects entire networks. Calls that are part
of a cross-country private network may be blocked.
Automatic routing features
Communication Manager 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)
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.