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AT&T Southeast PBX Trunks

By Joyce Sims,2014-06-30 05:37
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Trunks Description ...................................................................................................... 1 Types .......................................................................................................... 1 Private Branch Exchange (PBX) Class of Service ............................................... 2 Restrictions/Limitations .............

Trunks

Description ...................................................................................................... 1

    Types .......................................................................................................... 1

    Private Branch Exchange (PBX) Class of Service ............................................... 2

    Restrictions/Limitations ..................................................................................... 2

    Billing ............................................................................................................. 2

Description

    Trunk Lines are a common group of central office lines (pooled) that terminate in Private Branch Exchange (PBX) systems, automatic call distributors, or any system in which the customer's premises equipment selects and seizes a vacant line for incoming and outgoing calls. Trunks lines do not terminate directly on a set. Trunks terminate in either the PBX common equipment or attendant position.

    Trunk lines may be provisioned and billed as flat rate, message rate, measured rate or usage based pricing service (UBP billing, message rate billing and measured rate billing are usage sensitive billing arrangements).

    Some dial-type PBXs may terminate only on combination trunk lines. Others terminate a mixture of one-way incoming, combination, and out-dial only trunk lines. The calling patterns of the PBX users determine the proper trunk line mix. Manual PBXs terminate only two-way trunk lines.

    Types

    Combination Trunk - Combination trunk lines provide both incoming and outgoing calling capability to users of a Dial PBX. Incoming calls terminate at the PBX attendant's console. To place outgoing calls, station users dial an access code, usually 9, to connect to a combination trunk.

    Inward Only Trunk - Inward only trunk lines (non DID Service) provides for the termination of incoming calls at the attendant console of a Private Branch Exchange (PBX). These trunks can be used in conjunction with Automatic Call Distributor (ACD) so that incoming calls can be routed directly to a station. Inward trunks can not be used to place outgoing calls from a PBX.

    Outward Only Trunk - Outward trunk lines provide one-way outgoing service for direct-dialed calls from the PBX (both local and long distance). The calls may be dialed by the PBX station user or by the PBX console attendant. The user accesses an outdial trunk by dialing a code, which is usually a nine (9).

    Two/Both Way Trunk - Two/Both Way trunk lines provide both incoming and outgoing calling capability to PBX users. These trunks are obsolete in some states and grandfathered in others.

    Fictitious Trunk - The USOC TFBCX is used the establish terminal (TER) one (1) for a Multiline Hunt Group (HML) when outdial trunk lines are in a stand alone HML without a combination or a inward trunk lines established as terminal 1 in a 1A or 5E Switch. A POTS telephone number is assigned to the TFBCX. The TLI number is the same as the telephone number (TN) on the first outdial trunk line established as terminal 3001.

    Private Branch Exchange (PBX) Class of Service

    Trunks users are divided into four (4) broad classes; business, hotel/motel, hospital and residence. The Private Branch Exchange (PBX) Class of Service selection for trunk lines is important to provisioning the type of service the customer requests.

    PBX Service provides an arrangement of switching equipment and stations for intercommunicating among the stations and for connections through the local and long distance telephone network to other subscribers.

    Restrictions/Limitations

    ; A trunk line is never connected to a telephone set All trunk lines with a PBX

    system must either be TouchTone or Rotary dial, with the following exception:

    o Incoming only trunk lines are never TouchTone, even when outgoing

    and combination trunk lines in the same PBX system are TouchTone

    equipped.

    o Outdial trunk lines do not hunt in the central office - they may be

    shown on the record as part of a multiline hunt group for

    administration purposes only.

    ; All restrictions applicable to Flat Rate, Message Rate, and Measured Rate

    service apply to trunk lines.

    o AL, FL, GA, KY, LA, MS, NC, SC - Only in a hotel/motel or hospital

    situation can a mixture of Flat Rate and/or Message, Measured or

    Usage Based Pricing service be mixed on the same account.

    o TN - Only in a hotel/motel or hospital situation can a mixture of Flat

    Rate and/or Message, Measured or Usage Based Pricing service be

    mixed on the same account for existing customers.

    o AL, FL, GA, KY, LA, MS, NC, SC - A mixture of Flat Rate, Message Rate,

    Measured or Usage Based Pricing trunk lines may be in the same hunt

    group only if each line or terminal is individually telephone number (TN)

    identified.

    ; A PBX trunk and a PBX NAR cannot be in the same hunt group.

    Billing

    ; The following are the types of billing arrangements a customer with Trunk

    Lines may choose from:

    o Flat Rate - This arrangement bills a fixed monthly rate for the trunks,

    regardless of the amount of usage. All flat rate trunks in a trunk group

    are billed at the same established rate. In other words, no matter how many calls the customer makes, the charge will not vary from month to month unless there is a rate change for the service itself.

    o Measured Rate - This arrangement is a method of providing usage

    sensitive local service which allows greater customer control of billing and is consistent with billing for other utilities i.e., gas and electricity. This arrangement bills a fixed rate for each trunk, allowing the subscriber a specified number of outgoing local messages each month. An additional charge is billed for each local message in excess of that allowed number. The first trunk is billed at a higher fixed rate than the additional trunks. There should be only one trunk designated as the first message rate trunk per account. Incomplete local outgoing calls, such as "don't answer" or "busy" conditions, are not counted in the total calls. Long distance calls placed on message rate trunks are billed in the normal manner.

    o Usage Based Pricing (UBP) - UBP provides flexibility, larger calling

    area, and more customer bill control. UBP allows customers to pay a low monthly access line charge with additional charges based on the number of calls, the distance the calls travel, the duration of the calls and the time of day that the calls are made.

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