Mitel SX-200 DIGITAL Pabx General Description Manual

							Automatic Route Selection and Tolf Control
6451RLl AOOBEZFigure 3-l Typical Tie Line
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
the use of the FX to its customers so as to permit them to call 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 (600 Service). Generally, each such
line is arranged to provide either inward or outward service, but not
both.3.08WATS divides the country into geographical regions known as
zones. Zones are incremental, numbering 1 through n, from the
home zone. For example, zone 4 provides a WATS subscriber in the
home zone (zone 1) with access to 
ali telephone subscribers in zones
1, 
23 and 4. Likewise, zone n provides a WATS subscriber in the home
zone with access to all telephone subscribers in all zones. Figure 3-3
shows Canadian WATS zones, l-6, and the zone numbering which is
unique to WATS subscribers with Area Code 613, where 
I\IIITEL Cor-
poration headquarters is located.
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							Automatic Route Seiection and Toll Control
AREA CODE 416
INDICATES
FOREIGN
EXCHANGELINE
M50RO AOlOE?Figure 3-2 Typical Foreign Exchange Line
3.09The rates for both Outward and Inward WATS are based on the
zone and the hours of service subscribed to by the customer.
Specialized 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.
3.11When a business subscribes to an SCC it is issued with an
account code (normally seven digits). Calls can then be routed
via the company’s office by dialing a digit string similar to that shown
in the following example:
9-745-9 234 wait for dial tone, 1234567 305-994-1234
-T
Trunk
-r
AL-rAccessCode
CodeLong
Distance
Number
seeCompany’s
Office
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							Automatic Route Selection and Toll Control
3.12The restriction of this service is that some XC directories are
limited to major locations. Therefore, to avoid additional toll
charges, the SCC company office must be within a local dialing dis-
tance. A typical SCC arrangement is shown in Figure 3-4.
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							Automatic Route Selectioc and Toll Control
6452ROECFigure 3-3 Canadian WATS Zoning (Zone 1 Being Area Code 613)
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							Automatic Route Selection and Toll Control
CANADA
INDICATES LINES RENTED
---BY CARRIER COMPANV
FROM TELEPHONE COMPANIES
B449RO AOLlIE.7Figure 3-4 Typical SCC Arrangement
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							Automatic Route Selection and ToH Control
4. DETAILED DESCRIPTION
introduction
4.01The ARS feature is part of the Generic 1000 and Generic 1001
software packages of the 
SX-200@ DIGITAL PABX, which auto-
matically selects one of a preprogrammed list of Trunk Routes every
time an outgoing call is made. The routes are selected via the digits
dialed, in order of cost (i.e., least expensive route first), and in accor-
dance with the caller’s 
.toll restriction. The use of digit analysis and
digit modification within the ARS package allows the system to recog-
nize and modify any digit string which is dialed by the user, thus
alleviating the need for the user to dial special trunk access codes, 
orto dial a different digit string for each of the various routes to the
same destination.
4.02The 
complele ARS package provides the following:
Alternative Routing
Least Cost Routing
Toll Control
Overlap Outpulsing
Expensive Route Warning
Callback QueueingCamp-on Queueing
Return Dial Tone.
Alternative Routing
4.03Alternative Routing is the automatic selection of an alternate
Trunk Route when the first choice is busy. Routes 
(e.g.9 tie
trunks or WATS lines), are preprogrammed in an implied order within
the Route List Definition Table as described in paragraph 5.13.
Least Cost Routing
4.04Least Cost Routing enables the customer to capitalize on the
cost benefits offered by each type of trunk by allowing the
installation company to define, via the Route Plans and Route Lists
Tab!es, the order in which the Trunk Groups are to be selected. A
number of different Route Lists can be defined to account for the
fluctuation in rates with respect to the day and time of the week.
Route lists are associated with day and time zones through the pro-
gramming of the Day Zones and Route Plans Tables, described in
paragraphs 5.05 and 5.16.
Toll Control
4.05Toll Control is an integral part of the ARS feature package. It
allows the customer to restrict user access to specific Trunk
Routes and/or specific directory numbers.
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							Automatic Route Selection and Toll Control
4.06Every peripheral device which is capable of accessing a trunk is
assigned a class of restriction (COR). These CORs are arranged
within COR Groups, which are associated with Trunk Groups through
the programming of the Route Definition table. The Route Definition
table defines:(l) a trunk group, (2) how the digits dialed are to be
modified, and (3) which classes of restriction CANNOT access the
route. A maximum of 50 COR Groups, each containing a maximum of
25 COR members, can be programmed. A COR Group is simply a list
comprised of several COR members. Once constructed, the group is
assigned a number (1 to 50). This is the number used in route defini-
tion.
4.07Toll control takes place in the following way. Each time a trunk
call is initiated, the system checks that the COR of the originat-
ing device is NOT included in the COR Group assigned to the selected
trunk route, thus verifying that the call is toll allowed (that is, the user
is authorized to make the call).
4.08
CORs are assigned to peripheral devices during the initial sys-
tem programming, in accordance with the customer’s require-
ments, and can be modified at any time from an attendant workstation
or CDE terminal by the proper authority (e.g., the telephone manager).
Overlap Outpulsing
4:09The basic principle of overlap outpulsing is to seize a trunk and
commence outpulsing as soon as sufficient digits have been
received to identify the route. This is necessary in order to minimize
the post-dialing delay which would otherwise be experienced due to
the serialization of digit collection, trunk seizure, and digit outpulsing.
The number of digits collected prior to outpulsing can be programmed
by the customer during Customer Data Entry (CDE). These digits may
be subject to digit modification prior to being passed to the appro-
priate sender (dial pulse or DTMF) for outpulsing. Subsequent digits are
collected by the system and are out-pulsed. At the end of dialing,
indicated by an interdigit time-out, or the dialing of a complete digit
string of known length, the dialing sender Is disconnected. System
Option 26 (No Overlap Outpulsing) inhibits overlap outpulsing for all
calls.
4.10The post-dialing delay (i.e., the time lapse between the comple-
tion of station dialing and the receipt of ringback) which would
be experienced when using a DTMF trunk, is minimum (slightly more
than 
1 second for a IO-digit number). If no overlap outpulsing is
enabled, the delay for a lo-digit number outpulsed over a dial pulse
trunk would be approximately 
16 seconds at 90 PPS.
4.4 1Trunk Routes are seized only after the ARS process has deter-
mined the validity of the call with respect to the caller’s class
of restriction. In this way, false traffic will not be generated at the CO
(or distant PABX) by aborted seizures.
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							Automatic Route Selection and Toll Control
Expensive Route Warning Tone
4.12The Expensive Route Warning Tone is a programmable option
which presents a tone to the user during call setup, and, if aSUPERSET qTM set is used, the message “EXPENSIVE ROUTE” appears
on the LCD, when the Route selected by ARS is programmed as an
expensive route. Any Route but the first may be programmed to deliver
an Expensive Route Warning Tone. When alerted by the warning, the
user then has the option of whether or not to continue the call.
Callback Queueing
4.13
Callback Queueing (Automatic Callback) allows a user who en-
counters busy tone after dialing an ARS digit string (i.e., all
trunks busy) to dial a callback access code, or, if a 
SUPERSET 4 set is
used, to select CALLBACK, and be placed in a queue for the first
available trunk. When a trunk becomes free, it will be seized, the
originating device will be rung back, and, when answered, the pre-
viously entered digits will be automatically outpulsed. Expensive Route
choices are skipped when ARS scans for an available trunk, when
honouring a callback.
Camp-on Queueing
4.14Camp-on Queueing allows the user who encounters busy tone
after dialing an ARS digit string (Le., all trunks busy) to wait
off-hook, or, if a SUPERSET’ 
qTM set is used, to select CAMP ON, and
remain off-hook until a trunk becomes free. (When a set other than a.
SUPERSET qTM set is used, the user remains off-hook for 10 seconds
and is automatically camped on to the busy trunk group,) When a trunk
becomes free, the system seizes it automatically, and the previously
entered digits are automatically outpulsed. Expensive Route choices
are skipped when ARS scans for an available trunk, when honouring a
camp-on.
Return 
Dial Tone
4.15Return Dial Tone is a programmable option which allows the
system to simulate CO dial tone for customers who consider
that its absence would confuse the users of their system. For further
information, refer to Part 5, ARS Tables, paragraph 5.21.
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							Automatic Route Selection and Toll Control
5. ARS TABLES
General5.01The ARS package is a network of tables, each of which contains
data relevant to the setting up of a trunk call, such as routing
options and 
CORs. The tables are interconnected through a series of
indices and pointers. A total of eight tables make up the ARS network.
They are, in order of programming:
COR Group Definition Table
Day Zone Definition Table
Modified Digit Table
Route Definition Table
Route Lists Table
Route 
Plans Table
ARS Digit Strings Table
ARS Nested Digit Strings Table.
5.02The hierarchy for the tables is shown in Figure 5-1. This hierar-
chy is followed by the system in deciding which routes to
select, and which users are toll-restricted on the selected routes. The
following paragraphs describe the layout and fields of each table. Refer
also to Section 
MiTL9108-093-206-NA, Installation Forms and Section
MITL9108-093-210-NA, Customer Data Entry, for further information.
The way in which the tables combine to form the ARS network is
described in general in Part 6, and in the scenario given in Part 7.
ARS 
C0R Group Definition Table (CDE Form 20)
5.03 The 
CORs of the peripheral devices are grouped within the
Class of Restriction Group Definition Table. These COR Groups
are referenced from the Route Assignment table and their contents are
Interrogated to determine whether or not the calling device has in-
sufficient privilege to complete the call. Absence of the calling device’s
COR frotn a COR Group indicates to the system that the call CAN be
completed. A maximum of 50 COR Groups, each containing a maximum
of 25 members, can be programmed. COR members are numbered in
the range 
1 through 25; COR Groups are numbered in the range 1through 50.
5.04The COR Group Definition Table has three fields:
CQR Group: This is a nonprogrammable field which lists the
COR Group numbers 1 through 50.
COR Group Members:This programmable field is used to
specify which COR Group members are to be associated with
the specified Group Number. COR member numbers range from
1 to 25 and may be entered in any order (member numbers
must, however, be separated with spaces) or, where entries are
consecutive, in the format, for example: l-13.
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							Automatic Route Selection and Toll Control
AR5
DIGIT STRINGS
TABLEIF TRUNK
\WAILABLE AND:ALLER’S COR IS 4UOT IN COR GROUP,rRlJNK SEIZED
Figure 
5-l AM Table Hierarchy
Page 
5-2