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AT&T TENNESSEETN-17-0056GENERAL EXCHANGE GUIDEBOOKFifth Revised P age 24EFFECTIVE: June 29, 2017A42. INTEGRATED SERVICES DIGITAL NETWORK (ISDN)A42.3 Primary Rate ISDNA42.3.1 GeneralA.B.C.D.E.F.G.H.P rimary Rate ISDN (a/k/a P RI) is an intraLATA offering supported by the Integrated Services Digital Network (ISDN)architecture.P rimary Rate ISDN provides an ISDN based DS1 access to the telecommunications network and includes the flexibility ofintegration of multiple voice and/or data transmission channels on the same line. The service will provide connectivitybetween ISDN compatible Customer P remises Equipment (CP E) and a serving central office. The service may not be installedat a carrier hotel, a collocation cage, or any similar location. The basic channel structure for P rimary Rate ISDN is twentythree 64 Kbps B-Channels and one 64 Kbps D-Channel. The customer has the option to activate up to 23 B-Channels on thefirst P rimary Rate ISDN arrangement and up to 24 channels on additional P rimary Rate ISDN arrangements. A Digital DataOnly option 1 and an Inward Data option are also available. The 23 B-Channels can be used to connect the customer's CP E tothe P ublic Circuit Switched Network, e.g., outward, inward and 2-way network access. Calling Number Delivery, CalledNumber Delivery, Outgoing Calling Name Delivery and Hunting functionality are inherent to this service. Incoming CallingName Delivery, an optional feature offered at rates listed in paragraph A42.3.4.D.5 is available in switch types whereequipped. Redirecting Number, an optional feature described in paragraph A42.3.3, is offered at no charge to the customer inswitch types where equipped. Numbers for use on P rimary Rate ISDN are available in this Guidebook. One Listing will befurnished at no charge for each P rimary Rate ISDN B-Channel. Additional listings can be obtained as specified in Section A6.P rimary Rate ISDN provides capability for the transmission of digital signals only. Clear Channel Capability and ExtendedSuperframe Format are inherent to the service.P rimary Rate ISDN is provided within a LATA from wire centers where appropriate ISDN facilities are available asdetermined by the Company. Special Construction charges may apply as specified in Section A5.P rimary Rate ISDN Access Lines furnished between a serving wire center and a customer's premises will be offered at a nondistance sensitive rate per P rimary Rate ISDN Access Line. If a customer wishes to utilize another Company providedtransport facility (e.g., SMARTRing service) that can meet the required standards to carry the P rimary Rate ISDN Access(DS1) Line, the customer will incur no charge for the P rimary Rate ISDN Access (DS1) Line. MegaLink service cannot beutilized to provide transport for P rimary Rate ISDN except where the P rimary Rate ISDN is terminated in FlexServ service.Asynchronous Transfer Mode (ATM) Service can be utilized to transport P rimary Rate ISDN Voice/Data - Flat Rate under theterms and conditions stated in paragraph A42.3.2.CD.Interoffice Channels furnished between central offices will be charged at rates based on airline distance between the centraloffices, except as provided in paragraph A42.3.2.Q.Airline distance between Company central offices shall be developed using the methodology found in paragraph B3.3.3.Fractional mileage shall be rounded up to the next full mile.The required components for P rimary Rate ISDN are as follows:- P rimary Rate ISDN Access Line where applicable- Interoffice Channels where applicable- P rimary Rate ISDN Interface- P rimary Rate ISDN B-Channels- P rimary Rate ISDN D-Channel- Numbers- Call TypesNote 1:Effective May 1, 2014, customers may not add the Digital Data Only option, and existing termplans for this option may not be renewed.(T)

AT&T TENNESSEETN-15-0056GENERAL EXCHANGE GUIDEBOOKThird Revised Page 25EFFECTIVE: December 1, 2015A42. INTEGRATED SERVICES DIGITAL NETWORK (ISDN)A42.3 Primary Rate ISDN (Cont'd)(T)A42.3.1 General (Cont'd)I.Incoming Call Extension (ICE) is an optional offering allowing customers to retain their numbers. Incoming Call Extension Same Rate Center (ICE-SRC) and Incoming Call Extension – Different Rate Center (ICE-DRC) may be used in any ANSAarrangement. ICE-SRC and ICE-DRC may be used if the ANSA customer’s non-equipped, serving wire center switch isreplaced by a PRI capable switch. ICE is only available within the local calling area.1. ICE-SRC applies if the Customer’s Serving Central Office and the ANSA office are in the same Toll Message RateCenter (TMRC). Rates and charges are applicable per number.2. ICE-DRC applies if the Customer’s Serving Central Office and the ANSA office are in different Toll Message RateCenters. Hunting between ICE numbers is not allowed. Rates and charges are applicable number or per path.Customers may be required to make CPE software modifications to translate dialed numbers into terminated numbers.J. Primary Rate ISDN B-Channel rates for the Voice/Data (Standard) option are listed in paragraph A42.3.4.C. Exchangeaccess is included as a part of the B-Channel rate and is offered on a flat rate basis and on a usage sensitive basis withRegionServ.K. Primary Rate ISDN B-Channel rates for the Digital Data Only option1 are listed in paragraph A42.3.4.C. Exchange access isincluded as a part of the B-Channel rate and is offered on a flat rate basis and on a usage sensitive basis with RegionServ.L. Primary Rate ISDN B-Channel rates for the Inward Data option are listed in paragraph A42.3.4.C. Exchange Access isincluded as a part of the B-Channel on a flat rate basis only.M. The Primary Rate ISDN Inward Data option is characterized by the following:1. It is arranged for inward service only. Originating calls will be denied.2. It is arranged to terminate analog and digital data calls only.3. The quantity of numbers associated with a Primary Rate ISDN Inward Data option arrangement must be equal to, or lessthan the quantity of Primary Rate ISDN Inward Data Interfaces comprising the arrangement, and all numbers must usethe same routing unless the customer subscribes to additional numbers as stated in paragraph A42.3.4.C.7. Thisrestriction does not apply to Inward Data Extended Reach Service.4. Calling Number Delivery, Called Number Delivery, and Hunting are inherent to the service.N. Voice calls on the B-Channel may be completed to both ISDN and non-ISDN lines.O. Digital Data Transmission on the B-Channel will be circuit switched at 64 Kbps within the switch and between ISDNcompatible central offices. ISDN interconnection to non-ISDN equipped central offices may be subjected to analogtransmission or sub-rated to 56 Kbps.P. Primary Rate ISDN Extended Reach Service (ERS) is available only for the Inward Data Option. ERS is designed to "extendthe reach" of the Inward Data Option customer from a centrally located metropolitan local calling area into the areas of theLATA which are "non-local" to the metropolitan area. The ERS customer purchases numbers within each desired "non-local"calling area to allow their clients to call them without incurring intraLATA Long Distance Message TelecommunicationsService charges.1. ERS is offered under two configurations:a. A Dedicated Route Arrangement, andb. A Final Route Arrangement.The ERS Dedicated Route Arrangement is only available where the target local calling area(s) have an ISDN equippedcentral office. It is intended for use where the volume of traffic is sufficient to warrant one or more dedicated DS1interoffice facilities. The ERS Final Route Arrangement will be utilized where the target local calling area(s) do nothave an ISDN equipped central office and/or the volume of traffic is insufficient to justify a dedicated DS1 interofficefacility.2. For ERS Dedicated Route Arrangements the customer must purchase ERS Remote Telephone Numbers (RTNs), ERSPrimary Rate Interfaces, and ERS B-Channels in the target local calling area(s). The ERS Primary Rate Interfaces andERS B-Channels are extended to the customer's premises (typically in a centrally located metropolitan area, but in thesame LATA as the target local calling area) via ERS Interoffice Channels and a Primary Rate ISDN Access Line or otherCompany provided transport facility.3. For ERS Final Route Arrangements the customer must purchase ERS RTNs in the target local calling area(s). Calls thatterminate to these RTNs are switched over intraLATA toll message trunk groups to the customer's local serving centraloffice where they terminate on ERS Final Route Primary Rate Interfaces and ERS Final Route B-Channels, via an ERSFinal Telephone Number (FTN). A Primary Rate ISDN Access Line or other Company provided transport facility isrequired for connection to the customer’s local serving central office.Note 1:Effective May 1, 2014, customers may not add the Digital Data Only option, and existing termplans for this option may not be renewed.(T)(T)(T)(T)(T)(T)(T)(T)(T)

AT&T TENNESSEEGENERAL EXCHANGE GUIDEBOOKTN-17-0068Second Revised Page 25.2EFFECTIVE: December 1, 2017A42. INTEGRATED SERVICES DIGITAL NETWORK (ISDN)A42.3 Primary Rate ISDN (Cont'd)A42.3.2 Terms and Conditions (Cont’d)A.B.C.(Cont'd)5. Upon expiration of the CSPP, if customer has not entered into a new CSPP contract (per Private Line Guidebook,Paragraph B2.4.9.A.7.a.(1) ), or term extension (per Paragraph 4.):- for customer contracts expiring prior to December 1, 2017, continue service at the Month-to-Month price thencurrently in effect for the Month-to-Month Payment Plan, or- for customer contracts expiring on or after December 1, 2017, continue service at the Monthly Extension rates in effectat the time the CSPP contract expires until the customer cancels or renews the service with a new CSPP contract.Subsequently, customers under the Monthly Extension rates may convert their existing service to either a 12- 24-or 36month CSPP at the then current rates. The customer will not be assessed any associated non-recurring charges as longas the physical serving arrangement does not change.Monthly Extension rates are equal to one hundred fifty percent (150%) of the customer's expiring contractual rate.;6. If Customer migrates a Primary Rate ISDN service or service component (the “Terminated ILEC Service”) to a qualifyingAT&T Business Voice over IP (BVoIP) Service, then AT&T will waive the Termination Liability Charge associated withthe Terminated ILEC Service if:(a)the Terminated ILEC Service has been installed at the Customer site for no fewer than 12 months, and(b)the replacement AT&T BVoIP Service is installed or available at the same Customer site as the TerminatedILEC Service.It is at the Company's sole determination whether a product change satisfies these requirements.Nonrecurring charges associated with the Primary Rate ISDN Access Line or Interoffice Channel facilities will not beapplicable when upgrading from an existing MegaLink service to Primary Rate ISDN. A Type 1 Service Change Charge asspecified in paragraph A42.3.4.G will be applicable for the MegaLink service upgrade in addition to nonrecurring charges forother Primary Rate ISDN rate elements ordered.No nonrecurring charges will be applicable when converting MegaLink ISDN service to Primary Rate ISDN or for convertingfrom one Primary Rate ISDN option to another, e.g. Voice/Data to Inward Data or Inward Data to Inward Data ExtendedReach Service (ERS). The term “conversion” means that the Primary Rate Interface(s) remain in place in the same centraloffice. If the Primary Rate Interface(s) are moved in connection with ERS, the change is considered a rearrangement, andterms and conditions stated in paragraph D are applicable. No termination charges are applicable for conversions when:1. The contract selected for the new Primary Rate ISDN arrangement is coterminous with the previous contract or is for a24 month period, whichever is longer, and,2. the service orders to disconnect the previous arrangement and to install the new Primary Rate ISDN arrangement arerelated together and received by the Company at the same time with no lapse in billing of service.Material appearing on this page previously appeared on page(s) 25.1 of this section.(T)(N)(N)(N)(N)(T)(M)(M)(M)(M)

AT&T TENNESSEEGENERAL EXCHANGE GUIDEBOOKTN-16-0023Third Revised Page 26EFFECTIVE: March 19, 2016A42. INTEGRATED SERVICES DIGITAL NETWORK (ISDN)A42.3 Primary Rate ISDN (Cont'd)A42.3.2 Terms and Conditions (Cont'd)D.Rearrangement charges stated in paragraph A42.3.4.G are applicable for moves of Primary Rate Interfaces from one centraloffice to another in connection with the initial installation of Inward Data ERS or for subsequent moves of Primary RateInterfaces from one central office to another for ERS Final or Dedicated arrangements. Termination Liability charges are notapplicable if the number of Primary Rate Interfaces is not reduced.E. Upgrades, from a MegaLink service and/or a MegaLink channel service contract arrangement, are permitted with noTermination Liability when:1. A new contract is selected for the Primary Rate ISDN equal to or greater in length than the arrangement beingterminated, and2. The service orders to disconnect the MegaLink channel service arrangement and to install the Primary Rate ISDN arerelated together and received by the Company at the same time with no lapse in billing of service.F. The minimum subscription period for which month-to-month Primary Rate ISDN is furnished and for which charges areapplicable is one month.G. Unless otherwise specified, the terms and conditions Primary Rate ISDN stated herein apply in addition to the terms andconditions set forth in Section A2.H. Customer Premises Equipment (CPE) that is compatible with the Primary Rate ISDN interface is the responsibility of thecustomer.I.The Company shall not be responsible if changes in any of the equipment, operations, or procedures of the Company utilizedin the provisioning of Primary Rate ISDN render any facilities provided by the customer obsolete, or require modification oralteration of such equipment or system, or otherwise affect its use or performance. Digital transmission rates at speeds lessthan those indicated may be accomplished as a function of the particular CPE furnished by the customer.J. Suspension of service is not allowed.K. Terms and Conditions for Allowance of Interruptions apply as specified in Section B2 of the Private Line Guidebook.L. Service Charges in Section A4 do not apply.M. Hunting rates, Direct Inward Dialing (DID) rates, Customized Code Restriction rates, Selective Class of Call Screening rates,and Foreign Exchange rates do not apply.N. (DELETED)O. Calling numbers transmitted via Primary Rate ISDN are intended solely for the use of the Primary Rate ISDN subscriber.Resale of this information is prohibited except the caller's numbers may be provided to the subscriber's client for those callssponsored or provided by that client where the client's identity is disclosed to the caller and the client agrees not to distributesuch information to others.P. Non-facility Associated Signaling (NFAS) provides the capability to control multiple DS1s with a single D-Channel. Thisfeature can be ordered where switch capabilities exist as stipulated in the vendor technical documentation and where switchcapacity exists. When NFAS is selected, the customer will order one Primary Rate ISDN arrangement with one D-Channeland up to 23 B-Channels. Additional Primary Rate ISDN arrangements are ordered with up to 24 B-Channels at rates andcharges provided in paragraph A42.3.4. The D-Channel activated on the initial arrangement serves the additional PrimaryRate ISDN arrangements. If the customer desires, he may also request a backup D-Channel with the NFAS option. TheVoice/Data (Standard) Primary Rate ISDN and Digital Data Only option1 Primary Rate ISDN arrangements may not be mixedin the same NFAS group.Q. When a customer's normal serving central office is not equipped to provide Primary Rate ISDN, the customer may be served,at the Company's option, from an equipped central office without incurring interoffice channel charges. Primary Rate ISDNcustomers to be served under this arrangement must sign an agreement that the service may be moved back at the Company’sdiscretion to the normal serving central office and to a probable number change when/if that office is equipped with ISDN.This is referred to as the Alternate Network Serving Arrangement (ANSA). If a customer, under ANSA, requests PrimaryRate ISDN from an ISDN equipped central office other than that determined by the Company, interoffice channel charges asspecified in paragraph A42.3.4.B will apply. Also, if a customer requests Primary Rate ISDN from a central office other thantheir normal serving office and ANSA does not apply, interoffice channel charges will apply as specified in paragraphA42.3.4.B. ANSA does not apply for Inward Data Extended Reach Service.Note 1:Effective May 1, 2014, customers may not add the Digital Data Only option, and existing termplans for this option may not be renewed.(D)

AT&T TENNESSEETN-15-0056GENERAL EXCHANGE GUIDEBOOKThird Revised Page 27EFFECTIVE: December 1, 2015A42. INTEGRATED SERVICES DIGITAL NETWORK (ISDN)A42.3 Primary Rate ISDN (Cont'd)A42.3.2 Terms and Conditions (Cont'd)The Primary Rate ISDN - Digital Data Only option1 provides for the transmission of data mode calls only. The Primary RateISDN - Digital Data Only arrangement will be provisioned with the customer's requested number of Digital Data Only Bchannels with no B-channels capable of transmitting voice mode calls in the same arrangement.S. The Primary Rate ISDN Inward Data option provides for the transmission of inward analog and digital data calls only.T. Terms and Conditions in Section A2 prohibiting the mixing of flat and message or flat and measured service do not apply forPrimary Rate ISDN.U. No usage charges apply for calls within the local calling area for Primary Rate ISDN customers utilizing the Flat Rate PrimaryRate ISDN B-Channel. Long Distance Message Telecommunications Service rates as specified in Section A18 apply forintraLATA calls terminated beyond the local calling area.V. The following usage terms and conditions will apply for all dialed sent paid local calls for Primary Rate ISDN customersutilizing the Usage Sensitive Primary Rate ISDN B-Channel:1. Usage charges will be billed at the usage rates described in A3.2.9 for RegionServ.2. Summarized total usage charges for calls within the Basic and Expanded Local Calling Areas will be reduced by fiftypercent prior to the application of the usage allowance. Time/Day discounts described in A3.2.9 do not apply.3. A usage allowance of 20.00 per activated B-Channel is applicable for all local calls terminating in Band A.4. Total billed usage charges above the allowance will not exceed 20.00 per activated B-Channel for calls terminating inBand A.5. Local calls that are not dialed sent paid (i.e., operator assisted, etc.) will be billed individually at the same usage ratesspecified in A3.2.9 (including Time/Day usage provisions), in addition to any applicable Local Calling Card Service orOperator Assisted Local Call surcharges. Such calls are itemized on the subscriber's billing statement and are billedoutside any applicable calling allowance or usage billing reductions for dialed sent paid local calls.W. The Next Route Index Feature allows a Primary Rate ISDN Digital Data Only customer to arrange analog calls to overflow toa Voice/Data arrangement in the same switch

(a) Package EZ1 Credit Per DSL 7.60 LPEO1 (b) Package EZ1A Credit Per DSL 8.10 LPE1A (c) Package EZ2 Credit Per DSL 8.10 LPEO2 (d) Package EZ2A Credit Per DSL 9.60 LPE2A A42.1.5 Optional Features Customers are required to subscribe to ISDN - Business Service (I