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ATT DEFINITY Communications System Generic 3 Instructions Manual

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    							Automatic Route Selection (ARS)
    Issue  3   March 1996
    3-207
    nSingle-stage dialing is supported for access to Feature
    Group D, whereas access to Feature Groups A and B requires two-stage 
    dialing. Two-stage dialing means that there is a pause for dial tone 
    between the two groups of dialed digits.
    nNo customer identification digits are required for access to Feature
    Group D.
    nA touch-tone telephone is required to enter a PIN code when accessing 
    Feature Group A or B. A rotary or touch-tone telephone may be used with 
    Feature Group D.
    Digit Conversion
    When the ARS access code and the called number are dialed, the d ialed 
    number is compared to entries in the Matching Pattern fields of the ARS Digit 
    Conversion Table sc reen. If all or part of the dialed number matches one of the 
    Matching Patterns on the form, the matching part of the d ialed number is 
    replaced by a new number from the “Replace” field on the form. This new 
    number is then used to route the call. The new numb er will route the call via AAR 
    over a private network. If no corresp onding entry is found in the AAR Digit 
    Analysis table, the ARS Digit Analysis table is searched for a match with the new 
    modified number and routed accordingly. (An intercept tone is supplied if a 
    match is not found and the call fails.)
    In G3r, digit analysis precedes toll analysis. Digit analysis implies both route and 
    conversion. The algorithm for d eciding how to analyze a call is as follows:
    nnumber of digits
    nmost digits matched
    nexplicit digits over wildcards (from left to right)
    nconversion nodes over route nodes
    The dialed number is compared with digit string entries on the ‘System’s Toll 
    Analysis’ form for a relationship with the system’s Restricte d Call List or 
    Unrestricted Call List.  If the dialed number matches a number assigned to a 
    Restricted Call List, the call may not be allowed to complete. Also, if the user is 
    toll restricted and the dialed number matches a numb er on the Toll List, the call 
    may not be allowed to complete. Calls that are not allowed to complete receive 
    intercept treatment when allowed by the unrestricted call list.
    The primary purpose of ARS digit conversion is to convert public network 
    numbers (to be routed with ARS) to private network numbers (to be routed with 
    AAR).
    NOTE:
    You can convert back to another AAS number or an extension, where the 
    extension most likely is a UUP. 
    						
    							Feature Descriptions
    3-208Issue  3   March 1996 
    This can save toll charg es and allow users to route calls on the customer’s 
    private network facilities. Also, unauthorized p ublic network c alls c an b e blocked 
    and routed to an attendant or receive interc ept treatment via d i git conversion.
    Table 3-12 shows several ARS Digit Conversion examples.
    The following conditions are assumed for the examples: ARS Access Code = 9, 
    AAR Access Code = 8, Home RNX (Private Network Office Code) = 222, Prefix 1 
    is required on all long-distance DDD calls, Dashes (-) shown in the ta ble are for 
    readability only. (G3r analysis is more flexible because multiple conversions are 
    permitted.) 
    						
    							Automatic Route Selection (ARS)
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    NOTE:
    The dialed digits are matched to the Matching Pattern that most c losely matches the 
    dialed number.  For example, if the dialed string is 957-1234 and matching patterns 
    Table 3-12. ARS Digit Conversion Examples
    OperationActual Digits 
    DialedMatching 
    PatternReplacement
     StringModified
    Address Notes
    DDD call to ETN 9-1-303-538-1345 1-303-538 362 362-1345 The call will be 
    routed via AAR on 
    the route selected 
    for RNX 362.
    Long-distance call 
    to presubscribed 
    carrier9-10 22 2 102 22 + DDD (bl an k) ( b la nk) The  c al l wi ll  be  
    routed as dialed 
    with the DDD 
    numb er over the 
    c ustomer’s network 
    facilities.
    Terminatin g a 
    loc al DDD call to 
    an internal station1-201-957-5567 
    or 957-55671-201-957-5 
    or 
    957-5222-5 222-5567. The call goes to the 
    home RNX 222, 
    Extension 5567
    Unauthorized call 
    to intercept 
    treatment9-1-212-976-1616 1-XXX - 9 7 6 # ( b la n k ) The  ‘‘# ’’  s i g ni fie s  th e  
    end of dialing.  Any 
    d igits dialed after 
    976 are ignored by 
    ARS.  The user will 
    rec eive intercept 
    treatment.
    International calls 
    to an atten dant9-011-91-672530 011-91 222-0111# 222-0111 The call is routed to 
    local switch (RNX 
    222), then to the 
    atten dant 
    (222-0111).  This 
    method may also 
    b e used to block 
    unauthorized IDDD 
    c alls.  The call can 
    b e routed to an 
    announcement by 
    replacing 0111 with 
    an an no un c e men t 
    extension.
    International call 
    from certain 
    European 
    countries 
    ne e d in g   d ial  to ne  
    detection0-00-XXXXXXXX 00 +00+ 00+XXXX The first 0 denotes 
    ARS, the second 
    p air of zeroes 
    denotes an 
    international c all, the 
    p luses d enote 
    ‘‘wait,’’ for dial tone 
    detection 
    						
    							Feature Descriptions
    3-210Issue  3   March 1996 
    957-1 and 957-123 are in the table, the match is on pattern 957-123. The call will  be 
    routed as dialed.
    Time of Day Routing
    After an ARS call passes through ARS digit conversion (with no Matching Pattern 
    found) and toll analysis allows the call, the Time of Day Plan Numb er of the 
    calling party is used to make the choice of an associated ‘Time of Day Routing’ 
    form.  On this form, a RPN is identified based on the time of day that is identified 
    to the Partition Group Number. This plan is then used to select the specific 
    partition of the ‘ARS Digit Analysis’ form, discussed later in this chapter, which 
    will determine how the call is routed.
    If Time of Day Routing is not assigned and  partitioning is enabled, the user’s 
    PGN is used to select the specific ‘ARS Digit Analysis’ form.
    See the AAR/ARS Partitioning and Time of Day Routin g features for more 
    information. G3r searches analysis and conversion tables simultaneously.
    ARS Digit Analysis
    The following a p plies to G3vs/G3s, G3i, and G3i-Global. ARS calls that pass 
    through ARS Digit Conversion, Toll Analysis, and Time of Day Routing, are 
    analyzed based on the Time of Day Routing Plan Number or (if Time of Day 
    Routing is not assigned) the user’s PGN.
    The system uses ARS Digit Analysis to comp are the d ialed numb er with entries in 
    an ARS Digit Analysis Table.  When the system finds a Dialed String entry in the 
    table that matches the dialed number, the ARS Digit Analysis Table maps the 
    dialed number to a specific Routing Pattern, discussed later in this chapter, and 
    Call Type. The selected Routing Pattern will then be used to route the call. The 
    ARS Digit Analysis Table screen also shows the minimum and maximum number 
    of trailing d i gits required for digit analysis of each dialed number. G3r supports 
    node number routing.
    Possible Call Types in the ARS Digit Analysis Table are as follows:
    n10-digit call within North America
    n7-digit call within North America
    nInternational call (in the United States, the international prefix
    is 011)
    nInternational operator
    nO perator-assisted call (0+)
    nService call (such as 811 for repair or 911 for emergency)
    nNational numb ers within a country (used outside North America)
    nUnknown call 
    						
    							Automatic Route Selection (ARS)
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    3-211
    Some special dialing p atterns are automatically mapped to a specific Routing 
    Pattern and Call Typ e. They c an, however, be c hang ed by the system ad ministrator and 
    probab ly will be c hang ed for PBXs used outsid e North Americ a. See 
    DEFINITY 
    Communic ations System Generic  3 Version 4 Implementation
    , 555-230-655, o r DE FI NITY  
    Communications System Generic 3 V2/V3 Implementation
    , 555-230-653, for a list 
    of these default translations.
    Normally, the “Route Pat” (routing pattern) field on the ARS Digit Analysis Table 
    screen contains a routing pattern numb er. However, this field may instead 
    contain a Remote Home Num bering Plan Area (RHNPA) table number (r1 
    through r32). An RHNP A is simply a concentrator for up to 1,000 calls. Calls are 
    routed to these ta bles by ARS/AAR Digit Analysis when an ARS Digit Analysis 
    table points to an RHNPA table. The next three dialed d i gits (the code) are 
    compared with the codes in the selected RHNP A t a b l e.  Each c o de on the table 
    is then ma p ped to a specific routing pattern numb er (one through 254).
    The RHNPA tables allow up to 1000 c odes to be handled by one entry in the Digit 
    Analysis ta ble.
    In summary, Digit Analysis is merely a method of selecting a routing pattern. The 
    routing p attern may be selected in two ways:
    nIt may be selected directly from the Digit Analysis ta ble.
    nThe Digit Analysis table may first have to select an RHNPA table which will 
    in turn select the routing pattern.
    Routing Patterns
    The digit translations p erforme d on an ARS call b y the Digit Analysis and RHNPA 
    tables cause a s pecific Routing Pattern to b e selected for the call. More than one 
    combination of dialed digits can point to the same pattern. A blank entry instead 
    of a Routing Pattern number provides intercept treatment. However, with ARS, 
    d i git translation should always point to a Routing Pattern. This way, calls to 
    unassigned office codes will b e intercepted by the central office, not by the 
    system. By allowing the unassigned codes to be intercepted by the central 
    office, the System Manager does not have to keep track of which office codes 
    are in service. If calls to some codes are to b e denied, this should be handled by 
    FRL assignment, not by intercept on the codes.  Facility Restriction Levels 
    (FRLs) and Traveling Class Marks (TCMs) are discussed elsewhere in this 
    chapter.
    The R outing Pattern applicable for a given call contains a list of trunk  groups that 
    can be used for the call. Trunk group access is controlled by FRLs. If access to 
    the public network is through a main switch (an Ac cess trunk group is selected 
    for the call), then the call will route through the main switch to one of the p u blic 
    network offices serving the main switch. The d igit manipulation necessary to 
    route the call is controlled by the Subnet Trunking feature. See the Subnet 
    Trunking feature. Otherwise, the digit string to be outpulsed is controlled by 
    ARS. ARS d igit manipulation is called  code conversion. Code conversion is used  
    						
    							Feature Descriptions
    3-212Issue  3   March 1996 
    to d etermine whether or not to outp ulse the d igit 1 on toll calls and whether to 
    insert, keep, or delete the NPA on toll calls.
    The following paragraphs describe how the switch decides what digits to 
    outpulse in specific situations.
    Digit 1 Outpulsing
    The d i git 1 may or may not be required at the public network office to which the 
    call will be routing. (If 1 is dialed on 7-digit calls at a stand-alone system 
    (non-ETN), the 1 is outpulsed by the system.)  In the other cases, the 1 
    outpulsing requirements are indicated in the system. Since any given call may 
    have a choice of routes, some of which may require a 1 and some of which may 
    not, this indication is associated with each route. Five choices are available and 
    are identified in translations by a Prefix Mark. Digit 1 outpulsing only a p plies to 
    calls administered as ‘‘fnpa’’ or ‘‘hnpa’’ in the ARS Digit Analysis table. The 
    values and meanings of the Prefix Marks are as follows:
    nPrefix Mark 0 — Suppress a user-dialed Prefix digit 1 for 10-digit FNPA 
    calls, but leave a user-dialed Prefix digit 1 for the following types of calls:
    — 10-digit calls that are not a dministered as FNPA or HNPA types in 
    the ARS Routing Table.
    — 7-digit HNPA calls
    nPrefix Mark 1 — Send a 1 on 10-digit calls, but not on 7-digit calls.
    nPrefix Mark 2 — Send a 1 on all toll calls (for examp le, all 10-d i git calls 
    and 7-digit toll calls).
    nPrefix Mark 3 — Send a 1 on all toll calls and keep or insert the NPA to 
    ensure that all toll calls are 10-digit calls. Note that a user- dialed Prefix 
    digit 1 for a 7-digit call makes it a toll call and, hence, NPA is also inserted 
    in this case.
    nPrefix Mark 4 — Always suppress a user-dialed Prefix d igit 1.
    NOTE:
    This capability is required, for example, when routing ISDN-PRI calls 
    to an AT&T 4ESS. If the prefix digit 1 were not suppressed, then the 
    4ESS would reach calls.
    Which of the five possible treatments of the 1 prefix digit should be administered 
    on a g iven route is based on the characteristics of the d istant office. Prefix Mark 0 
    is prevents the system from sending a 1 prefix digit for 10-digit FNPA  calls. 
    However, the system leaves a user-dialed prefix digit 1 for 7-digit HNPA calls 
    and 10-digit calls that are not administered as FNPA or HNPA types in the ARS 
    Routing Table.
    Prefix Mark 1 causes the system to send a 1 prefix on all 10-digit FNPA  calls.
    With Prefix Marks 2 and 3, the decision is based on whether the call is a toll call. 
    Toll Lists are provid e d in the system to furnish this information. A Toll List sim ply  
    						
    							Automatic Route Selection (ARS)
    Issue  3   March 1996
    3-213
    indicates if the office code associated with the call constitutes a toll call from the 
    interconnecting office (not from the local system). Up to 32 Toll Lists are 
    provided. The  applicable list num ber, if any, for the call is given in the Routing 
    Pat te rn.
    Prefix Marks are only applicable on 7- or 10-digit DDD public network calls. 
    Requirements for outpulsing a 1 are specified via Prefix Marks and go into effect 
    when the call accesses is outpulsed. Digit 1 outpulsing only applies to calls 
    administered as ‘‘fnpa’’ or ‘‘hnpa’’ in the ARS Digit Analysis table.
    NPA Deletion and Insertion
    Each public network route in the ARS Routing Pattern contains an indication of 
    the NPA of the distant end of the trunk group.  If this NPA is the same as the NPA 
    associated with the call, the NPA is deleted prior to outpulsing unless the Prefix 
    Mark is 3 and the call is a toll call in the associated Toll List.
    NPA d eletion and insertion only a p plies to calls administered as ‘‘fnpa’’ or ‘‘hnpa’’ 
    in the ARS Digit Analysis table.
    The NPA is inserted on 7-digit calls if the distant NPA is different from the home 
    NPA or if the Prefix Mark is 3 and the call is a toll call in the associated Toll List.
    The preceding  paragraphs d escribe NPA deletion or insertion when the call is an 
    ARS 7- or 10-digit DDD call. An ARS call accessing a tandem trunk is another 
    example of NPA insertion.  If the call is a 7-digit ARS call, the system inserts the 
    home NPA  before sending the call to the tandem trunk.  Therefore, all ARS calls 
    accessing a tandem trunk are 10-digit calls. Whether or not the d i git 1 is sent on 
    a tandem call is determined by the prefix rules. This enables the system to 
    distinguish between ARS calls and the 7-digit on-network calls.
    IDDD and Service Code Dialing
    IDDD calls other than those using Subnet Trunking need not be mo dified before 
    outpulsing. Since  international numbers can be of variable length, the system 
    awaits a d ialing time-out before processing the call. The US ARS default dialing 
    time-out is three seconds for the 0 and 1 prefix digits, but is 10 seconds for the 
    called number. In other countries, the three se cond timer will ap ply to all 
    numbers administered as valid dialed destinations that also happen to be 
    sub-strings of a longer valid dialed destination. The calling party can sp eed up 
    call processing by dialing the end-of-dialing digit # after the called numb er.  
    Receipt of this digit cancels the remaining time-out interval.  The system always 
    outpulses the # digit for use by the distant switch, whether dialed by the calling 
    party or not (unless it is an ISDN trunk or it is su ppressed on the ‘Trunk’ form).
    Subnet Trunking is not required for service codes. If the prefix digit 1 is dialed 
    before the code, it is outpulsed.
    ARS can provide individual Routing Patterns for each type of call. An ARS call 
    can b e processed via the RHNPA table. This is particularly useful on international  
    						
    							Feature Descriptions
    3-214Issue  3   March 1996 
    calls, since the RHNPA table can be used on the country code.  Thus, call 
    routing can be determined according to the called country, rather than handling 
    all international calls alike.
    Operator and Operator-Assisted Calls
    Calls to an o perator (0 by itself) with 0 as the attendant access code, require a 
    three-second time-out or dialing of the # digit before the call is processed. 
    Operator-assisted calls (0 plus a 7- or 10-digit number) require 10-digit dialing if 
    the call is within a home NPA and there are office codes within the home NPA 
    which look like NPAs. (On directly dialed calls, this distinction was made by 
    prefix digit 1 dialing.)  All other dialing is the same as direct dialing.
    O perator-assisted calls, like IDDD calls, can be routed on the first three digits of 
    the called number.  Through the use of Subnet Trunking, this means that different 
    long-distance carriers can be selected for different calls.
    These examples are for the US and will d iffer in other countries.
    Considerations
    ARS provides the most-preferred usage of public network facilities available at a 
    system.
    Routing Patterns, toll lists, and RHNPA ta bles are shared between partitions.
    Internal memory resources  used for ARS Digit Analysis are shared b y Automatic 
    Route Selection (ARS), Automatic Alternate Routing (AAR), Digit Conversion, 
    and Toll Analysis features. A “ Percent Full” field on the ‘ARS’ and ‘AAR Digit 
    Analysis’ sc reens indicate how many of these resources have been used.
    If a customer changes ARS routing assignments, it is the customer’s 
    responsibility to notify the RSC network designer and the SCO technician of the 
    changes in order to receive their continued support.
    Interactions
    The following features interact with the Automatic Route Selection (ARS) feature.
    nAAR 
    ARS and AAR can access the same trunk groups and share the same 
    Routing Patterns, toll lists, and RHNPA ta bles. ARS calls may be 
    converted to AAR calls.
    nARS
    When an ISDN/BRI station dials sufficient digits to route a call, b ut could 
    route differently if a dditional digits were dialed, the station will not 
    recognize the Conference or Transfer buttons. The user must delay dialing  
    						
    							Automatic Route Selection (ARS)
    Issue  3   March 1996
    3-215
    for three se conds or dial a # to indicate the call can be routed based on 
    the digits already dialed. The Conference or Transfer b uttons are then 
    recognized and the operation is completed by the switch.
    nAbbreviated Dialing
    FRL checking is bypassed on an ARS call made via a privileged 
    Abbreviated Dialing Group List.
    nAttendant Control of Trunk Group Access
    Attendant control of a trunk group, in effect, removes the trunk group from 
    the Routing Pattern.  The trunk group is never accessed by the Automatic 
    Route Selection (ARS) feature.  ARS calls do not route to the attendant.
    nCAS 
    A CAS Attendant may extend a call out of a Branch PBX by use of ARS. 
    The call is extended over an RLT by dialing the appropriate feature 
    access code and number. The call is routed as determined by ARS 
    administration at the Branch PBX.
    nToll Restriction
    Toll Restriction is checked on ARS calls.
    nControlled Restriction, Origination Restriction, and Outward Restriction
    These features prohibit access to the Automatic Route Selection (ARS) 
    feature.
    nForced Entry of Account Codes
    Prefix marks and other digits inserted from routing patterns will not be 
    used in determining whether a call is a toll call.   See  the  Forced Entry  of 
    Account Codes feature for more information.
    nGR S 
    The Generalized Route Selection (GRS) feature works with ARS to 
    provide call routing over the a ppropriate trunking facilities.  Routing is 
    determined by the type of call being made.  With GRS, calls may be 
    routed differently than they would with just ARS.  For details on GRS, see 
    the Generalized Route Selection (GRS) feature description elsewhere in 
    this chapter.
    nMisc ellaneous Trunk Restrictions
    Misc ellaneous Restrictions are not checked on ARS calls.
    nPCOL 
    A trunk assigned as a PCOL may not be assigned to any ARS routing 
    pattern.
    nRingback Queuin g
    Ringback Queuing can be used on ARS calls originate d at the switch that 
    provides the queuing.  Incoming tie trunk calls will not queue on an 
    outgoing trunk group. 
    						
    							Feature Descriptions
    3-216Issue  3   March 1996 
    If a multi-appearance voice terminal user has an Automatic Callback 
    button, makes an ARS call, and all trunks are busy, Ringback  Queuing  is 
    activated automatically.
    nCDR 
    An ARS c all using a trunk group marked for CDR is indicated b y the d ialed 
    access code and by a Condition Code. The dialed number is recorded as 
    the called numb er.  Subnet Trunking does not affect CDR.
    G3r can record outpulsed digits. If CDR generation is administered for a 
    trunk group assigned to a Routing Pattern, data will be collected for all 
    calls routed through the trunk group. If an CDR account c o de is to be 
    dialed with an ARS call, it must be dialed before the ARS access code is 
    dialed.
    nVoice Terminal Display
    The voice terminal display shows the dialed digits (not outpulsed d igits). 
    The called-party shown on the display is that of the trunk group actually 
    used. The “ Mis c ellaneous Call Id entification”  field on the display will show 
    ARS.
    An ISDN-BRI station may format these display fields differently, and the 
    timing of disp lay u p dates may be different.
    Administration
    ARS is initially assigned on a per-system basis by an AT&T service technician. 
    After the feature is activated, the following items are administered by either the 
    System Manager or the service technician:
    nARS Access Code 1 (one to three digits)
    nARS Access Code 2 (one to three digits)
    nARS Digit Analysis Table (1 per PGN)
    nARS Digit Conversion Table
    nUp to 32 RHNPA Tables
    nUp to 32 Toll Lists
    nFR L s  — Assigned via COR to each originating facility.
    nUp to 254 ARS Routing Patterns
    nTrunk Groups to be used with ARS
    nWhether or not the system returns dial tone after the ARS FAC is dialed on 
    trunk calls 
    						
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