Mitel SX 200 DIGITAL Pabx General Descriptions Manual

Automatic Route Selection and Toll Control
1. GENERAL
introduction1.01This Section contains a comprehensive description of the Auto-
matic Route Selection (ARS) feature of the 
SX-200@ DIGITAL
PABX. Parts 2 and 3 provide the reader with background information on
the North American Numbering Plan and on the routing options offered
to PABX owners by telecommunications companies. A clear under-
standing of these parts is essential in order to fully implement ARS.
The remainder of the document is dedicated...

SECTION MITLSI 09-094-220-NAPage 2 

Automatic Route Selection and Toll Control
2. NUMBERING PLANS
General2.01The ARS feature is universal, insofar as it is compatible wit.hany numbering plan which may be employed by any public
network. It is, however, necessary to understand the numbering plan of
the public network which serves the PABX in order to make full use of
the toll application of the ARS feature.
North American Numbering Plan
2.02The purpose of any numbering plan is to enable any subscriber
in the network to be connected to any...

SECTION MITL9109-094-220-NASome examples are:
Operator
0Service Number
411
Local Call592-1111
Toll Call Within an Area
l-256-2222
Toll Call to Another Area
1-416-486-3333
Toll Call Within an Area (NO 1 prefix)
256-2222
Page 4 

Automatic Route Selection and Toll Control
3. CALL ROUTING OPTIONS
General ’
3.01Telephone companies offer a number of different methods of
routing calls over the public network (e.g., tie trunks, WATS
lines), each of which has a different cost structure. Correct use of
these trunks can provide substantial savings to the user.
3.02 To determine which routing options are best suited to any
given PABX a traffic survey should be completed by the in-
stallation company prior to installation. The Traffic...

SECTION MITL9109-094-220-NAOTTAWA CO
AREA CODE 613
AREA
CODE 416
-INDICATES TIE LINE
Figure 3-l Typical Tie Line Figure 3-l Typical Tie Line
6451RO AOOBE26451RO AOOBE2which are within close proximity to one another. For example, a com-
pany located in Ottawa which does much of its business with com-
panies located in and around Toronto could benefit from an FX line, as
shown in 
Figure 3-2. The second application allows a company to offer
\
/AREA CODE 613///iAREA CODE 416
INDICATES
- - -FOREIGN
EXCHANGE...

Automatic Route Selection and Toll Control
the use of the FX to its customers so as to permit them to c.all the
company office (the PABX) without incurring toll charges.
Wide Area Telephone Service (WATS)
3.07 The Wide Area Telephone Service is designed to meet the
needs of customers who make or receive a large number of
long distance calls to or from the same geographical region(s) within
the home country. Calls are 
.originated via Outward WATS lines and
received over Inward WATS lines (800 Service)....

SECTION MITL9109-094-220-NASpecialized Common Carrier Service (SCC)
3.10Specialized Common Carrier Service, offered by private com-
panies, provides telephone service between major locations at
a rate which may be less than that charged by the telephone com-
panies. The rate is based on monthly subscription plus a usage charge.
Specialized Common Carriers must be approved by local Communica-
tions Regulations, and may not be universally available. Currently, SCC
services are not available in Canada....

Automatic Route Selection and Toll Contro/-KA0731ROEOFigure 3-4 Typical SCC Arrangement
- - - INDICATES SPECIALIZED COMMON
CARRIER COMPANY LINESPage 9 

SECTION WllTL9109-094-220-NAPage 10