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ATT DEFINITY Communications System Generic 3 Instructions Manual

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    							Integrated Services  Digital  Network (ISDN) — Basic 
    Rate Interface (BRI)
    Issue  3   March 1996
    3-797
    Administered Connections
    An Administered Connection is an end-to-end connection between two access 
    endpoints or d ata endpoints that is automatically established by the system 
    whenever the system is restarted or the Administered Connection is a dministered 
    and the Administered Connection is due to be active. The attributes of these 
    connections are user-defined and administered on the “Administered 
    Connection” form via the G3-MT.
    Once the ADM has been a dministered as one endpoint of an administered 
    connection, the system waits for the scheduled time to set u p the connection. At 
    the scheduled time, the system establishes the connection and maintains it for 
    the specified length of time. Once the call is accepted, the set enters into the 
    continuous mo de for the specified length of time. If the switch is reboote d during 
    the continuous connection, the connection reinitiates the call setu p. At any time 
    that the connection drops (for examp le, disconnected cabling), the switch 
    re-initiates the call setup.
    Call Request
    The DEFI NI TY s yst em  Generic 3 call processing handles all various BRI Bearer 
    data call requests that are presently defined. Some capabilities that are not 
    supported by AT&T terminals may be provided by a non-AT&T terminal. The 
    switch completes most call requests. For those c a pabilities the switch does not 
    support, a proper cause value is sent back to the terminal.
    Cause Value
    BRI stations receive a cause or reason c o de that identifies why the call is being 
    cleared. The BRI data modules convert certain cause values to text messages 
    and d isplays them for the user.
    Considerations
    The system supports up to 60 simultaneous voice calls on a BRI since two 7507 
    terminals (that support 30 call ap p earances/bridged appearances each) can be 
    administered on a BRI port.
    The following features are not provided to BRI users:
    nSince the ISDN-BRI protocol requires that the Bearer Cap a bility must be 
    specified at the time of sending the SETUP  message (and cannot be 
    changed during the call), the following data functions are not provid e d to 
    the BRI voice users:
    — One b utton voice call setup transfer to d ata
    — One b utton data call setup transfer to voice
    — Preindication of a data call
    — Voice call transfer to d ata and data call transfer to voic e 
    						
    							Feature Descriptions
    3-798Issue  3   March 1996 
    These functions require a change in the Bearer Cap a bility after the 
    establishment of the call, which is currently not allowed by the BRI 
    protocol.
    nFeatures that use the switchhook and Recall button (for example, Call 
    Waiting and Analog Conference/Transfer/Hold/Drop) are a p plicable to 
    analog voice terminals only
    The DEFI NI TY s yst em  s u pports BRI data endpoints that perform layer 2 
    disconnect. BRI data endpoints that support layer 2 disconnect are administered 
    as non-Management Information Message (MIM) supporting data only 
    endpoints.
    The DEFI NI TY s yst em  s u pports non-AT&T BRI voice and data terminals that 
    perform enbloc sending using any one of the following formats:
    nA  S ETUP   message with all the digits in the Keypad IE and a Sending 
    Complete IE.
    nA  S ETUP   message with all the digits in the Called Party Number IE and a 
    Sending Complete IE.
    nA  SETUP  message with all the digits in the Called Party Number IE and no 
    Sending Complete IE.
    If you are using a 7506D or 7507D to make calls that require a d ditional digits, 
    you can place a comma in the dial sequence after you receive a second dial tone 
    or after the call has been set up. The comma is used to separate the called 
    number from subsequent information.
    Interactions
    The following features interact with the ISDN-BRI services:
    nData Button
    Besides the call appearance and feature function buttons, BRI voice/data 
    terminals have a fixed, dedicated data button (button 7 on the 7505D and 
    7506D voice terminals, and button 31 on the 7507D voice terminal) that is 
    used for data call setup. In g eneral, feature function buttons such as Call 
    Forwarding or Send All Calls buttons are always associated with voice 
    features, and cannot be used in conjunction with the data button. For 
    example, the user cannot activate call forwarding for the associated data 
    endpoint by using the data button followed by the Call Forward ing button 
    and the designated extension.
    nInterworking
    The same off-premises call types are permitted as for DCP, with the 
    exception of voice to data and data to voice transfer. 
    						
    							Integrated Services  Digital  Network (ISDN) — Basic 
    Rate Interface (BRI)
    Issue  3   March 1996
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    nModem Poolin g
    The Modem Pooling feature provides the necessary protocol conversion 
    between Mode 2 digital data endpoints and analog data facilities. A 
    modem pool resource needs to be inserted by call processing during call 
    setup for both call origination and c all answering. This resourc e translates 
    data between DMI Mode 2 protocol used by BRI data endpoints and the 
    modulated signal used by the modem.
    nPre-Selection
    When an ISDN-BRI station assigned with the “Select Last Used 
    Appearance?” field of the “Station” form set to yes completes a transfer 
    while off-hook using the handset, the user will be left hearing a dial tone on 
    the last-used appearance, rather than the silence heard in the same 
    situation by an user of other station types.
    nVoice Terminal Display
    BRI terminals take control of the disp lay. For example, when the user is in 
    dialing state (BRI terminal is in the Overlap Sending state) any display 
    information sent to the terminal from the switch is buffered until the state 
    changes and is displayed when the state changes.
    The 7506 BRI voice terminal, which has a 2-line 24-character display, 
    splits a message when it recognizes a b lank closest to the 24th c haracter. 
    This is left to the discretion of the terminal. As a result, the switch has no 
    control over it.
    nBusy Tone Forward Disconnect
    BRI terminals require that the Busy Tone Forward Disconnect (BTFD) 
    feature b e turned off. With BTFD of f,  an a g e nt (with Malicious Call Trace) is 
    able to change states after a call. 
    Administration
    BRI Voice/Data
    Administration of BRI voice terminals requires all the fields associated with the 
    standard DCP station administration. Ad ditional fields are used to enter the 
    following information:
    nTEI information: If the BRI terminal supports a fixed TEI value, it has to be 
    entered at the time of station administration. The allowed values are 0 
    through 63. There are two fields: “Fixed TEI” and “TEI Value” . If the answer 
    to the first field is yes, the second field shows u p where the TEI value is 
    administered. The TEI value on the “Ad ministration”  form must match the 
    value supported by the terminal.
    nMIM support: This is an “ A dministrable”  field on the “BRI Station” form. If 
    the answer to this field is ‘‘yes,’’ the following two fields need to be filled in: 
    						
    							Feature Descriptions
    3-800Issue  3   March 1996 
    1. Endpoint Initialization: If the BRI terminal supports endpoint 
    initialization, the administrator has to enter the SPID value. The 
    default value is the extension; however, the value can be changed 
    at the time of a dministration. The SPID can be up to 10 digits, and 
    uniquely identifies the terminal on the BRI. The SPID on the 
    “ Administration”  form and the SPID programmed into the endpoint 
    must be the same. (Refer to the terminal’s user manual in ord er to 
    change the terminal’s SPID.) All SPIDs must be d ifferent for each 
    endpoint on the same port. All SPIDs must be different from the 
    service SPID, which is administered on the “System Maintenance” 
    form.
    2. MIM Maintenance / Management sup port: This is another BRI 
    specific field that indicates if the terminal supports other 
    maintenance and management messages.
    For multipoint (passive bus) environment, the system administration checks the 
    number of B-channels used for a port. Administration denies any attempt which 
    might cause call blocking by restricting the numb er of en d points on a port.
    NOTE:
    Separate extensions numbers are used for voice and d ata calls to the same 
    endpoint.
    Any PC/ISDN Platform configuration (stand-alone, with handset/headset, or 
    with voice terminal) should be administered with MIM support set to ‘‘no’’. 
    Other administrable features depend on the PC software application (if the 
    application supports data transmission, the ‘‘Data Module’’ field must be 
    set to ‘‘yes’’).
    BRI Data
    The 7500 Data Module is a dministered through the “Data Module Ad ministration”  
    form. The ADM is a dministered through the “Station Ad ministration”  form, using 
    the data module administration p a ge. In add ition to the fields used by the DCP 
    endpoints, the following new fields are used for BRI data module administration:
    nDefault Duplex: Full/Half (default Full)
    nDefault Mo de: Synchronous/Asynchronous (default Asynchronous)
    nDefault Speed: 1200, 2400, 4800, 9600, 19200, 56000, and 64000 (default 
    1200)
    (In synchronous mode, the speed of the 7500 data module may be set to 
    56,000 or 64,000 bps.)
    nDefault Data Ap p lication: mode 0, mode 1, mode 2 sync, mode 2 async, 
    and mode 3/2 adaptable
    Default Duplex, Default Mode, and Default Speed values are used for initializing 
    data module d efault attributes. The defaults are required for modem pooling 
    conversion resource insertion when the en d point does not support MIM query  
    						
    							Integrated Services  Digital  Network (ISDN) — Basic 
    Rate Interface (BRI)
    Issue  3   March 1996
    3-801
    capability. If you are using supported end p oints (7500 and ADM), you should not 
    change the d efault values. Changing the default values with the MIM 
    Maintenance/Management support o ption as ‘‘y’’ has no effect on modem 
    pooling. These endpoints support the MIM query capability, which enables the 
    switch to query the endpoint when a call arrives.
    Default Data Ap p lication specifies the default data protocol to b e used for 
    originating data calls if mode is not sp ecified with the calling parameters. This 
    mode is also use d for Administered Connections and for terminating trunk calls 
    that do not have bearer capability specified.
    Data mo dules that sup p ort two simultaneous data calls should be administered 
    as a 7500 and the MIM Maintenance/Management support option should be set 
    to ‘‘n.’’
    NOTE:
    Two simultaneous data calls to a single endpoint use the same extension 
    numb er.
    Hardware Requirements
    BRI services require the following hardware:
    nThe TN778 Packet Control circuit pack. This circuit pack provides the 
    interface to the LAN (packet) bus on G3i (but not G3r) for establishing the 
    signaling connectivity.
    nThe TN556 BRI p ort circuit pack, which is the Basic Rate Line circuit pack. 
    Each BRI p ort board  c an support 12 line interfaces, each operating at 192 
    kbps.
    nA TN2198 two-wire BRI port circuit pack can be used in place of the 
    TN556. In this case an NT1 is also required.
    nISDN-BRI Typ e B and Type D Terminal Management S/T interface 
    terminals.
    nThe AT&T ISDN 7505, 7506, 7507, 8503T, 8510, and 8520 voice terminals.
    nThe 7500 Data Module and the ADM. The ADM is supported by the AT&T 
    ISDN 7505, 7506, and 7507 voice terminals with firmware version FP2.0 or 
    later.
    nThe PC/ISDN Interface card used in conjunction with a standard PC and 
    one to four voice terminals.  See the 
    PC/ISDN Platform Installation and 
    Reference 
    manual, 555-016-102, for a d ditional information. Also see the 
    PC Interface feature d esc rib e d in this book. 
    						
    							Feature Descriptions
    3-802Issue  3   March 1996 
    Integrated Services Digital Network
    (ISDN) — Primary Rate Interface
    Feature Availability
    ISDN-PRI is an optional feature that can be purchased with any Generic 3 
    releases except G3vs/G3s ABP. 
    Description
    Allows connection of the system to an Integrated Services Digital Network (ISDN) 
    by using a standard ISDN frame format called the Primary Rate Interface (PRI). 
    The ISDN gives the system users access to a variety of public and private 
    network services and facilities. The ISDN-PRI standard consists of layers 1, 2, 
    and 3 of the Open System Interconnect (OSI) model. In ISDN-PRI, the 
    transmission standard for layer 1 (the physical layer), is either DS1 (T1) or CEPT1 
    (E1).
    The DS1 (T1) is a digital transmission standard that in North America carries 
    traffic at the digital signal level-1 (DS1) rate of 1.544 Mbps. T1 facilities are also 
    used in Japan and some Middle-Eastern countries. It consists of a 1.536 Mb ps 
    signal multiplexed with an 8 kbps framing channel. The 1.536 Mb ps signal is 
    divided into 24 channels (DS0s) of 64 kbps each, numb ered 1 - 24. The ‘‘D’’ 
    (data) channel multiplexes signaling messages for the ‘‘B’’ (bearer) channels 
    carrying voice or data. When a D-channel is present, it o c cupies Channel 24.
    The CEPT1 (E1) is a d igital transmission standard that  carries traffic at a rate of 
    2.048 Mbps. It is used in Europe and elsewhere. The E1 facility is divided into 32 
    channels (DS0s) of 64 kpbs information numb ered 0-31. Channel 0 is reserved 
    for framing and synchronization information. When  a D-channel is present, it 
    occupies channel 16.
    The DEFI NI TY s yst em  of f ers several administrable protocols, each of which 
    provides a different set of services that ISDN-PRI allows. For country 1 (U.S.A.), 
    users can administer either the AT&T Switched Network or National ISDN-2. 
    These protocols are discussed in detail later in this section. For other countries, 
    the DEFINITY system provides a Global ISDN-PRI. This includes any combination 
    of services, including (but not limited to) Basic Call, DDI, Disp lay, and QSIG. The 
    services available with Global ISDN-PRI are country-dependent. (Please refer to 
    the QSIG  Global  Networking  feature.
    ISDN-PRI signaling in the system is supported by the TN767 (for 24 channels) or 
    the TN464C or later version (for 24 or 32 channels) DS1/E1 Trunk circuit packs, 
    coupled with (for all releases except G3r) the TN765 Processor Interface circuit 
    pack. The  D-channel (signaling channel) is switched through the TN765 circuit 
    pack. 
    						
    							Integrated Services  Digital  Network (ISDN) — Primary 
    Rate Interface
    Issue  3   March 1996
    3-803
    NOTE:
    For G3r, the D-channel information can only use the TN464C (or later 
    version) circuit pack; TN767 can be used for NFAS interfaces carrying only 
    B-channels, but not for ISDN signaling information (D-channel).
    With the ISDN-PRI, the system can interface with a wide range of other products 
    including network switches, PBXs, and host computers. These products include 
    the following:
    nPublic Network switches (for example, 4ESS, 5ESS, Northern Telecom 
    DMS250, etc.)
    nDEFI NI TY Com munications System Generic 2 and System 85 R2V4.
    nDEFI NI TY Com munications System Generic 1
    nDEFI NI TY Com munications System Generic 3
    nSome of the other products that adhere to the ISDN-PRI signaling 
    protocol.
    As an example of how the ISDN-PRI is used in private and public network 
    configurations, see Figure 3-20 and Figure 3-21. As seen in these figures, the 
    ISDN-PRI c a n b e u se d to interface a PBX to a Public Switched Network, a PBX to 
    a Host Computer, or a PBX to another PBX.
    Figure 3-20. ISDN-PRI Private Network Configuration
    ISDN-PRI DEFINITY
    COMMUNICATIONS
    SYSTEM
    HOST
    COMPUTERDEFINITY
    COMMUNICATIONS
    SYSTEM
    DEFINITY
    COMMUNICATIONS
    SYSTEM 
    						
    							Feature Descriptions
    3-804Issue  3   March 1996 
    Figure 3-21. ISDN-PRI Public Network Configuration
    AT&T Switched Network Protocol
    The AT&T Switched Network Protocol is an ISND-PRI protocol that uses 4ESS 
    implementation. The DEFI NIT Y syst em  ISDN-PRI implementation is consistent 
    with the ITU-T Recommendation Q.931 and Q.921 for ISDN signaling. The AT&T 
    Switc h ed  Network provides system users with the following services:
    nAccess to AT&T Switched Network Services (for example, SDN, MEGA, 
    etc.)
    nCall Identification Display
    — Calling Party Num ber (CPN)
    — Billing Number (BN)
    — Calling and Connected Number Display
    — Calling and Connected Party Name Display
    nCPN/BN to Host Call Identification
    nPrivate Network Services
    nWideband (NxDSO, H0, H11, H12) (both private and public networks)
    nCall-by-Call Service Selection
    These services are discussed in detail in the following subsections.
    ISDN-PRI DEFINITY
    COMMUNICATIONS
    SYSTEM
    HOST
    COMPUTERPUBLIC
    SWITCHED
    NETWORK
    (4 ESS)DEFINITY
    COMMUNICATIONS
    SYSTEM
    DEFINITY
    COMMUNICATIONS
    SYSTEM ISDN-PRI 
    						
    							Integrated Services  Digital  Network (ISDN) — Primary 
    Rate Interface
    Issue  3   March 1996
    3-805
    Access to AT&T Switched Network Services
    ISDN-PRI pro vides access to AT&T Switched Network Services such as SDN 
    (Software Defined  Network), SDDN (Software Defined Data Network), 
    MEGACOM, etc. An ISDN-PRI trunk group may be dedicated to a particular 
    feature. Alternately, an ISDN-PRI call-b y-call trunk group may provide access to 
    several features. For a description of the ASN services accessible via ISDN-PRI 
    (either via dedicated or call-by-call trunk groups) see the Call-by-Call Service 
    Selection feature description elsewhere in this document.
    Call Identification Display
    ISDN-PRI Call Identification Display provides a transparent name/number d isplay 
    for all display-equipped voice terminals within an ISDN-PRI network. The feature 
    is transparent in that the same information is provided at all ISDN-PRI facilities. 
    Voice terminals using this feature should be digital voice terminals with a 
    %40-character alphanumeric display. The Merlin hybrid sets with 32-character 
    displays (7315H and 7317H) also support this feature.
    ISDN-PRI Display Information is provid e d in addition to the normal Voice 
    Terminal Display and Attendant Display features, when the network supports 
    end-to-end ISDN-PRI connectivity. When both ISDN-PRI and DCS d isplay 
    information, or DCS display information only, are received, the switch displays 
    the DCS  display information in the DCS format. If ISDN disp lay information is 
    received, and no DCS display information is received, then the ISDN display 
    information is displayed in the ISDN formats.
    Two types of identification numb ers are provided with the ISDN-PR I. These 
    identification numbers may be used in the various typ es of displays used with the 
    ISDN-PRI. The two types of identification numbers are as follows:
    nCalling Party Num ber (CPN): A 0 to 15 d igit DDD number ass o ciated with 
    a specific station.  When a system user makes a call that uses the ISDN, 
    that user’s CPN is provided by the system for the ISDN. The “CPN Prefix” 
    form is administered to create a 0-15 digit CPN from a local station 
    number.
    nBilling Number (BN): The calling party’s billing number that is provided to 
    an inter-exc hange network via Equal Ac cess or Centralized Automatic 
    Message A c counting (CAMA). This number is stored at either a local or 
    network switch. If a customer is connected directly to the AT&T network, 
    the BN  is the customer’s billing numb er stored in that network. If the CPN 
    is not provided on an incoming ISDN-PRI c a ll, the system uses the BN for 
    the station identification numb er.
    The following types of display information are provided with the ISDN-PRI.
    nCalling Party’s Number
    The calling party’s number is shown on the called p arty’s display. On calls 
    generated from a DEFINITY system, the calling party’s number is a 0- to 
    15-digit DDD number. This number is provided only if the outgoing 
    ISDN-PRI trunk group is administered to send the CPN and if the “ CPN  
    						
    							Feature Descriptions
    3-806Issue  3   March 1996 
    Prefix”  form is a dministered to c reate a CPN. For G3vs/G3sV1, G3iV1, and 
    G3rV1, the Calling Party number, if sent, is always 10 digits long. On calls 
    incoming to a system, the network may provide either the CPN or BN as 
    the calling party’s numb er.  Exc ept for G3i-Global, dashes are inserted in 
    the displayed number between the area code (if shown), the office code, 
    and the local number. Extension numbers and 12-digit international 
    numbers are shown without dashes. For G3V2 and later releases, dashes 
    are only used for 7-digit and 10-digit numbers when the ‘‘North American 
    Area Code’’ field is administered on the ‘‘Dial Plan” form.’
    nCalling Party’s Name
    The calling party’s name is shown on the called party’s display. On calls 
    generated from a DEFINITY system, the calling party’s name is provided if 
    the ISDN-PRI trunk group is administered to send the name to the network. 
    On calls incoming to a DEFINITY system, the (p ublic or private) network 
    may provide the calling party’s name. If the calling party’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 is shown on the calling party’s display. On 
    calls generated from a DEFINITY system, the called party’s number is 
    shown on the calling party’s display as the calling party dials the number. 
    If the (public or private) ISDN network provides the connected party’s 
    number, the calling party’s display is u pdated 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 calls 
    incoming to a DEFI NIT Y syst em . The 0-15 d i git number of the p arty who 
    answers the call is provided to the ISDN network only if the incoming 
    ISDN-PRI trunk group is administered to send the CPN to the network and 
    the “ CPN Prefix”  form is a dministered to create a CPN.
    NOTE:
    The connected party may or may not be the party actually called.
    For G3vs/G3sv1, G3iV1, and G3rV1, the connected party number, if sent, 
    is always 10 digits long.
    nConnected Party’s Name
    The connected party’s name is shown on the calling party’s display. On 
    calls generated from a DEFINITY system, the (public or private) ISDN 
    network may provide the connected party’s name to the DEFINITY  syst em,  
    when the call is answered. If the connected  party’s name is not available, 
    the calling party’s disp lay shows 
    ANSWERED BY, followed by the 
    connected party’s numb er (if available). 
    						
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