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Lucent Technologies DEFINITY Enterprise Communication Server Release 8.2 Administrators Guide

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    							DEFINITY ECS Release 8.2
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    As an example of how ISDN is used in private- and public-network 
    configurations , see the following figures. For example, ISDN can be used to 
    connect a switch to a public-switched network, to other switches, and to 
    computers:
    AT&T Switched Network Protocol
    DEFINITY ECS supports the AT&T Switched Network Protocol described in the 
    TR41449 (for 4ESS to common carrier) and TR41459 (for 5ESS to CO) ISDN 
    protocol standards as defined by AT&T. This protocol is used when the DS1 
    circuit pack is administered for Country Code 1, Protocol Version a. The AT&T 
    Switched Network provides you with the following services.
    Access to AT&T Switched Network Services 
    ISDN provides access to AT&T Switched Network Services. The definition of the 
    Service Type field on the ISDN Trunk Group screen includes a table that outlines 
    these switched-network services. An ISDN trunk group may be dedicated to a 
    particular feature. Alternately, an ISDN call-by-call trunk group may provide 
    Figure Notes
    1. DEFINITY ECS
    2. ISDN trunk3. Public switched network
    4. Host computer 
    						
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    access to several features. For a description of the services accessible via ISDN 
    (either via dedicated or call-by-call trunk groups), refer to ‘‘
    Call-by-Call Service 
    Selection’’ on page 1295.
    Call Identification Display
    ISDN Call Identification Display provides a transparent name and number display 
    for all display-equipped telephones within an ISDN network. The feature is 
    transparent in that the same information can be provided at all ISDN facilities. 
    Telephones using this feature should be digital telephones with a 40-character 
    alphanumeric display. The Merlin hybrid sets with 32-character displays (7315H 
    and 7317H) also support this feature.
    ISDN Call Identification Display is provided in addition to the normal Telephone 
    Display and Attendant Display features when the network supports end-to-end 
    ISDN connectivity. When both ISDN and DCS display information are received, 
    the switch can display either the DCS or ISDN call identification information. If 
    only ISDN display information is received, information displays in ISDN format.
    The display fields that may be used for ISDN are: Name, Number, Miscellaneous 
    Call Identification, and Reason for Call Redirection. The display information 
    varies, depending on the type of call, how the call is handled (for example, 
    whether it is redirected or not), and the information is available on the call. 
    CPN/BN to Host Call Identification
    The CPN/BN to Host Call Identification enables CPN and BN information to be 
    passed from the switch to the ISDN Gateway, so that the ISDN Gateway can 
    forward the information to a host for data-screen delivery to agents in an ACD 
    split.
    By delivering call-identification information such as CPN/BN and switch 
    information such as the answering-agent’s extension to an adjunct network (ISDN 
    Gateway), the adjunct automatically delivers data screens to agents for new calls 
    and call transfers.
    The figure below shows a simplified diagram of a CPN- and BN-to-host 
    arrangement. The ISDN Gateway is a UNIX or MSDOS computer connected to 
    the switch on one side and to a host computer on the other side. The connection to 
    the switch is over a synchronous interface with BX.25 protocol. 
    						
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    Private network services 
    In addition to providing access to switched-public networks, ISDN provides 
    private-network services by connecting DEFINITY ECS in an Electronic Tandem 
    Network (ETN), Distributed Communications System (DCS), or QSIG Network. 
    This gives you more efficient private networks that support new integrated voice 
    and data services. ETN, DCS, and QSIG networking services are provided as 
    follows.
    ETN services
    DEFINITY Enterprise Communication Servers that function as tandem nodes in 
    an ETN can be interconnected using DS1 trunking facilities with ISDN. All 
    signaling between the tandem switches is done with ISDN D-channel and normal 
    ISDN protocol. The ISDN can also be used to connect ETN tandem and main 
    switches. In this case, the main switch collects all of the address digits from local 
    users as well as users at other satellite and tributary switches, and originates a call 
    over ISDN to the tandem switch.
    Figure Notes
    1. ISDN trunk
    2. SID/ANI
    3. DEFINITY ECS
    4. BX.25
    5. ISDN Gateway6. Existing interface
    7. Host computer
    8. Telephone
    9. ACD agent position
    10. Data terminal
    r781861 CJL 060996 
    						
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    Automatic Alternate Routing (AAR) and Automatic Route Selection (ARS) are 
    used with ISDN and DS1 trunking facilities to access ETN facilities. AAR and 
    ARS are used to collect the dialing information for the call that is originated from 
    the main switch.
    DCS services
    ISDN-PRI facilities can be used in a DCS arrangement whenever tie trunks are 
    used to connect the DCS nodes. Most DCS features are not affected by ISDN-PRI. 
    However, there is a minor impact on a few of the DCS features, as far as the 
    functions that the local and remote switches perform. 
    QSIG services
    QSIG networking provides compliance to the International Organization for 
    Standardization (ISO) ISDN private-networking specifications. The QSIG 
    Networking platform is supported over the ISDN Basic Call setup protocol. 
    DEFINITY ECS supports QSIG Supplementary Services. 
    Wideband Switching (ISDN-PRI only)
    Wideband Switching provides support for services that require large bandwidth, 
    such as high-speed video conferencing. Wideband also supports multiple channel 
    calls end-to-end. These services have traditionally been handled by dedicated 
    facilities. With Wideband Switching, dedicated facilities are no longer a 
    requirement for these large bandwidth services.
    Call-by-Call Service Selection 
    Call-by-Call Service Selection allows the same ISDN trunk group to carry calls to 
    a variety of services or facilities. Embodied in this feature is the ability to allocate 
    usage. It provides significant flexibility for creating user-defined incoming and 
    outgoing services and is used on any ISDN trunk group.
    Access to Software Defined Data Network 
    With ISDN, the SDDN service may be accessed. SDDN provides virtual 
    private-line connectivity via the switched public network. The services provided 
    by SDDN include voice, data, and video applications. SDDN services 
    complement the ISDN voice services.
    Access to Switched Digital International
    Switched Digital International (SDI) provides 64 kbps of unrestricted connectivity 
    to international locations via the AT&T Switched Network. It is also the backbone 
    for the AT&T International ISDN network. SDI complements the ACCUNET 
    digital service already available to United States locations. This service can be 
    accessed using Call-by-Call Service Selection. SDI provides economical 
    high-speed data transfer to international locations. 
    						
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    National ISDN-2 Services
    DEFINITY ECS supports National ISDN-2 (NI-2), which offers many of the 
    same services as the AT&T Switched Network protocol. The NI-2 protocol is used 
    when the DS1 circuit pack is administered for Country Code 1, Protocol 
    Version b. 
    NI-2 provides users with the following services:
    nCalling Line Identification
    nNon-Facility Associated Signaling (ISDN-PRI only)
    nD-Channel Backup (ISDN-PRI only)
    nWideband Switching (ISDN-PRI only)
    nCall-by-Call Service Selection
    Calling Line Identification
    Calling Line Identification for NI-2 is essentially Calling Party Number (CPN) 
    identification, as previously described.
    Non-Facility Associated Signaling (ISDN-PRI only)
    Non-Facility Associated Signaling (NFAS) allows an ISDN-PRI T1 or E1 
    Interface D-channel (signaling channel) to convey signaling information for 
    B-channels (voice and data) on ISDN-PRI T1 or E1 facilities other than the one 
    containing the D-channel. See ‘‘
    Facility and Non-Facility Associated Signaling’’ 
    on page 1331 for more information.
    D-Channel Backup (ISDN-PRI only)
    D-Channel Backup is provided to improve reliability in the event of a 
    signaling-link failure. See ‘‘
    Facility and Non-Facility Associated Signaling’’ on 
    page 1331 for more information.
    Wideband Switching (ISDN-PRI only)
    Wideband Switching for NI-2 is essentially the same as that of the AT&T 
    Switched Network ISDN-PRI protocol.
    Call-by-Call Service Selection
    Call-by-Call Service Selection for NI-2 is essentially the same as that for the 
    AT&T Switched Network ISDN-PRI protocol. 
    						
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    ISDN interworking 
    ISDN interworking allows calls to use a combination of both ISDN and non-ISDN 
    trunking and station facilities. A non-ISDN trunking facility is any trunk facility 
    supported by the system that does not use the ITU-T recommended Q.931 
    message set for signaling. Non-ISDN trunking facilities include facilities such as 
    analog trunks, AVD DS1 trunks, and DS1 trunks with bit-oriented signaling 
    (robbed-bit or common channel).
    DEFINITY ECS supports the conversion of ISDN signaling to non-ISDN in-band 
    signaling and the conversion of non-ISDN in-band signaling to ISDN signaling 
    for interworking purposes.
    A mixture of ISDN and non-ISDN signaling is required in order to provide 
    end-to-end signaling when using different types of trunk or station facilities on a 
    call. See the figure below for an example of interworking. 
    In this example, a call for someone at Switch B comes into Switch A. 
    Interworking allows the ISDN signaling of the call to be converted at Switch A to 
    non-ISDN in-band signaling before the call forwards to Switch B. Even though 
    the call comes into Switch A on an ISDN trunk, Switch A can send the call to 
    Switch B over a non-ISDN trunk by converting the signaling information.
    The system provides accurate CDR billing information on calls that are not 
    interworked. Accuracy of CDR billing information on interworked calls is 
    equivalent to the accuracy provided by the public network.
    DEFINITY ECS supports sending a non-ISDN trunk name as the connected 
    name. Therefore, a non-ISDN trunk name can be sent as the connected name even 
    when a call starts out as an ISDN call but is interworked over non-ISDN trunks.
    Figure Notes
    1. Call from network to Switch B
    2. ISDN trunk
    3. Switch A4. Non-ISDN trunk
    5. Switch B 
    						
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    Call Identification Display
    Two types of identification numbers are provided with ISDN and may be used in 
    the various types of displays used with ISDN. The two types of identification 
    numbers are as follows:
    nCalling Party Number (CPN): A 0–15 digit DDD number associated with a 
    specific station. When a system user makes a call that uses ISDN, that 
    user’s CPN is provided by the system for ISDN. ISDN public-unknown 
    numbering or ISDN private numbering forms are administered to create a 
    0–15 digit CPN from a local station number.
    nBilling Number (BN): The calling party’s billing number, which is 
    provided to an inter-exchange network via Equal Access or Centralized 
    Automatic Message Accounting (CAMA). This number is stored at either a 
    local or network switch. If a customer is connected directly to the AT&T 
    Switched Network, the BN is the customer’s billing number stored in that 
    network. If the CPN is not provided on an incoming ISDN call, the network 
    uses the BN for the station identification number.
    The following types of display information are provided with ISDN:
    nCalling Party’s Number
    The calling party’s number appears on the called party’s display. This 
    number is provided only if the outgoing ISDN trunk group is administered 
    to send the CPN, and if ISDN public-unknown numbering or ISDN private 
    numbering forms are administered to create a CPN. On calls incoming to a 
    system, the network may provide either the CPN or BN as the calling 
    party’s number. Extensions and 12-digit international numbers display 
    without dashes. Dashes are only used for 7-digit and 10-digit numbers 
    when North American Area Code is enabled on the Dial Plan screen.
    nCalling Party’s Name
    The calling party’s name appears on the called party’s display. On calls 
    generated from a DEFINITY ECS, the caller’s name is provided if the 
    ISDN trunk group is administered to send the name to the network. On 
    calls incoming to a DEFINITY ECS, the (public or private) network may 
    provide the caller’s name. If the caller’s name is not available, the called 
    party’s display shows “CALL FROM” instead, followed by the calling 
    party’s number (if available).
    nConnected Party’s Number
    The connected party’s number appears on the caller’s display. On calls 
    generated from a DEFINITY ECS, callers’ displays may show the digits 
    dialed as the call is made. If the (public or private) ISDN network provides 
    the connected party’s number, the calling party’s display is updated to show 
    the connected party’s number. The format of the connected party’s number 
    is the same as that of the calling party’s number described previously on  
    						
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    calls incoming to a DEFINITY ECS. The 0–15 digit number of the party 
    who answers the call is provided to the ISDN network only if the incoming 
    ISDN trunk group is administered to send connected number to the 
    network and ISDN public-unknown numbering or ISDN private numbering 
    forms are administered to create a CPN.
    NOTE:
    The connected party may be the party actually called, in the event the 
    call is transferred before the connected party answers the call.
    nConnected Party’s Name
    The connected party’s name appears on the calling party’s display. On calls 
    generated from a DEFINITY ECS, the (public or private) ISDN network 
    may provide the connected party’s name to the DEFINITY ECS, when the 
    call is answered. If the connected party’s name is not available, the calling 
    party’s display shows ANSWERED BY, followed by the connected party’s 
    number (if available).
    On calls incoming to a DEFINITY ECS, the connected party’s name is 
    provided if the incoming ISDN trunk group is administered to send the 
    name to the network.
    Depending on how the switches involved in a call are configured, parties may see 
    none, some, or all the information described above.
    Displays for redirected calls
    Features such as Call Coverage, Call Forwarding All Calls, Bridged Call 
    Appearance, or Call Pickup redirect calls from the called party’s extension to 
    some other destination. Once the redirected call has been connected at its new 
    destination, the displays for the calling, called, and connected parties are as 
    follows:
    — Calling Party Display
    a= CONNECTED NAME   CONNECTED NUM     MISCID
    — Called Party Display
    This is the display of the party the caller originally dialed. If this party 
    bridges onto the redirected call after it has been answered, they see:
    a= CONFERENCE 2
    In this situation, the connected party’s display (see below) shows the same 
    information. The calling party’s display is also updated if the calling and 
    called parties are on the same switch. 
    						
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    — Connected Party Display
    The connected party is the party who answers the redirected call. 
    a= CALLING ID    to    CALLED ID          R
    The R indicates the reason for redirection. The CALLING ID and the 
    CALLED ID may be the name or the number, depending on the 
    information received from the far end.
    Displays for conference calls
    Both terminal and attendant conference calls are identified as calls with “n” 
    number of conferees. This display information generates locally and does not 
    change the display on another switch. If the conference call eventually drops back 
    to a two-party call, the original display information is restored. However, when 
    two DCS and/or ISDN calls (or any possible combination of each) are 
    conferenced and revert to a two-party call, the trunk group of the remaining call 
    displays.
    Displays for calls to hunt groups
    On ISDN calls to a hunt group extension, the caller’s display identifies either the 
    name of the hunt group or the name of the group member who answers the call, 
    depending on hunt group administration.
    Displays for calls to Terminating Extension Groups (TEG)
    On ISDN calls to a TEG, the caller’s display identifies either the group or the 
    group member who answers the call, depending on administration.
    Caller Information Forwarding
    With CINFO you can use a vector collect digits step to retrieve caller entered 
    digits (ced) and customer database-provided digits (cdpd) supplied by the network 
    in an incoming call’s ISDN SET UP message. ISDN is required if the CINFO 
    comes from the network.
    Facility Restriction Level and Traveling Class 
    Mark
    The TCM used to pass on the originating facility’s FRL is sent by ISDN facilities 
    in the SETUP message only if the trunk services type is tandem.
    Information Indicator Digits (II-digits)
    With II-digits you can make vector-routing decisions based on the type of the 
    originating line. II-digits are provided for an incoming call by ISDN-PRI. It is a 
    generally available ISDN AT&T Network service. 
    						
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    Malicious Call Trace (MCT)
    ISDN calling number identification is sent when MCT notification is activated on 
    an ISDN trunk. 
    Multiple Subscriber Number (MSN) - Limited
    The ISDN standard MSN feature lets you assign multiple extensions to a single 
    BRI endpoint. A side effect of supporting the NT interface is the MSN feature 
    works with BRI endpoints allowing the Channel ID IE to be encoded as 
    “preferred.” The endpoint must be administered as the far end of an NT-side 
    ISDN-BRI trunk group. Also, you must use the Uniform Dial Plan (UDP) feature 
    to assign the desired extensions to the “node” at the far end of the trunk group.
    Overlap Sending
    You can administer overlap sending on AAR and ARS calls routed over ISDN 
    trunk groups. This allows you to send and receive digits one digit at a time instead 
    of enbloc. (With enbloc, digits are not sent until the entire group of digits is 
    received).
    Interactions
    nAustralia Malicious Call Trace
    A DEFINITY ECS with a BRI connection to the Australian public network 
    is able to notify the network if a user in a private network invokes the 
    Malicious Call Trace feature. This works on Australian national 
    connections.
    nDirect Inward Dialing
    Some public network operators may not offer full Direct Inward Dialing 
    service on BRI trunks, but instead may offer the BRI equivalent, which 
    typically is called Multiple Subscriber Number (MSN). This is the case if 
    the public network treats the BRI as an endpoint interface rather than a 
    trunk group interface.
    In such a case, the network only routes up to 10 public numbers to a 
    particular pair of BRI trunks. Furthermore, the network may not let calls 
    overflow from one BRI trunk to another.
    nD-Channel Backup
    D-Channel Backup is not supported on BRI connections.
    nDistributed Communications System
    If both DCS and ISDN features are provided over the same facility with a 
    DEFINITY ECS, DCS displays generally override ISDN displays. 
    However, with DEFINITY ECS, the ISDN connected name and number  
    						
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