Inter-Tel CS-5200 Manuale Utente

Page  158

Class of Service

•

Exemption from ARS-Only Restriction: Each trunk group may be designated as
“exempt from automatic route selection (ARS) only.” If exempt, endpoint users with
the ARS-Only class of service can select the trunk group directly.

•

Absorbed Digits: Trunk groups that are subject to toll restriction can be programmed
to “absorb” (ignore) the first digit(s) dialed. This allows the system to handle the dialed
digits just as they would be by the local telephone company or PBX to which the sys-
tem is connected.

•

Endpoint and Trunk Group Classes of Service: Each endpoint and trunk group can
be assigned one or more classes of service (COS) to restrict or allow certain digit pat-
terns when an outside call is dialed. Trunk group COS is not checked if ARS is used.

Each endpoint and each trunk group that is subject to toll restriction is assigned a toll restric-
tion class of service (COS) that restricts dialing patterns on outside calls.

COS is programmed individually for endpoints, voice processing system applications, and
trunk groups. Separate COS designations are available for day and night modes. An endpoint
or trunk group can be completely unrestricted or can have a combination of COSs. 

System Speed Dial numbers can be programmed to bypass COS restrictions on a system-wide
basis. If the option is not enabled, all System Speed Dial numbers are subject to toll restriction.

Because a condition may exist where a critical or life-threatening situation needs to be
reported, using the Emergency Call feature code will override all toll restrictions and trunk
access programming.

Note that if the trunk group is not subject to toll restriction, neither the trunk group nor end-
point COS is checked, unless the call is placed using ARS. ARS calls are subject to endpoint
toll restriction only.

The first nine COS designations (01–09) have default values. COS designations (10–16) do not
have default values and are blank. All of the classes of service are programmable. Each may be
specified as an “allowed” or “denied” class of service, dialing patterns can be programmed for
each, and each can be assigned to endpoints and trunk groups as needed. 

The default values of COS 01–09 appear in the following table.

01

ARS Only

This is an endpoint class of service only. It is not used for trunk 
groups. Also, the Automatic Route Selection (ARS) feature, which 
is standard on the Inter-Tel CS-5200/5400, is required. Calls can 
only be placed using the ARS feature. The user will hear reorder 
tones when attempting to place a call using any other method. A 
restricted user can still select individual trunks if the trunks are 
designated as “exempt from ARS Only,” as described on 

, or if they were transferred, were placed on hold, or are 

recalling or ringing. Trunk restriction determines which trunks in 
the ARS route group can be selected by the endpoint or applica-
tion.