1、 ATIS-0300065 LOCATION ROUTING NUMBER (LRN) ASSIGNMENT PRACTICES Reissued with the resolution of Issue 850. April 20, 2018 Copyright 2018 by the Alliance for Telecommunications Industry Solutions, Inc. All rights reserved. The Location Routing Number (LRN) Assignment Practices dated April 20, 2018,
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17、 Practices April 20, 2018 ATIS-0300065 1 Location Routing Number Assignment Practices These practices are intended to assist Service Providers1as to why Location Routing Numbers (LRNs) are necessary and how to select their own LRNs. The use of LRNs is covered in the ATIS Packet Technology Systems Co
18、mmittee (formerly Committee T1S1) standards and the FCC North American Numbering Council Local Number Portability Administration Working Group (LNPA WG) best practices2and some of that direction is incorporated in these practices. An LRN is a 10-digit number, in the format NPA-NXX-XXXX, that uniquel
19、y identifies a switch or point of interconnection (POI) per LATA. The NPA-NXX portion of the LRN is used to route calls to numbers that have been ported. The following LRN assignment criteria should be considered when a service provider selects and assigns an LRN: 1. A unique LRN will be provisioned
20、 to identify each recipient switch or POI in the number portability capable network3. LRNs are to be used for routing and not for rating/billing calls. Calls are rated and billed to an end-user based on the dialed digits and not on the LRN. There is, however an Automated Message Accounting feature t
21、hat records the LRN that a call is routed to in order to determine the appropriate provider serving that number for access billing purposes4. 2. A service provider will establish one (1) LRN per LATA from an assigned NXX for each recipient switch or POI in the number portability capable network. Add
22、itional LRNs may be used for internal purposes. Further, additional LRNs are not required to identify US wireline rate centers. A unique LRN may be assigned to every LNP equipped switch or POI (and potentially to each CLLI5listed in the iconectiv LERG Routing Guide). Requesting an additional NXX to
23、establish an LRN in certain instances may be justified but precautions need to be taken to ensure number resource optimization. The following points should be considered prior to requesting a new NPA-NXX for the purpose of establishing an LRN: The requesting service provider uses an existing code al
24、ready homed to the tandem where the LRN is needed for the POI. Once the NXX Code is assigned, the Code Holder must return any blocks not justified for retention in its inventory. When there are multiple tandems owned by different SPs in a single LATA, the requesting SP may obtain a new NXX in order
25、to establish an LRN for each subtending POI. Regulatory waivers granted to ILECs to carry local calls across a LATA boundary may exist. In such instances, SPs may be justified in establishing an additional LRN to properly route calls. 1The term “service provider” refers to a telecommunications carri
26、er or other entity that receives numbering resources from the NANPA, a Pooling Administrator or a telecommunications carrier for the purpose of providing or establishing telecommunications service. For the purposes of this part, the term “service provider” includes an interconnected VoIP service pro
27、vider (47 CFR 52.5 (e). 2See the LNPA WG pages at . 3ATIS PTSC Standard: ATIS-1000002, Number Portability for Switching Systems (documents available at the ATIS Document Center at www.atis.org may have an associated fee). 4See footnote 2. 5CLLI and LERG are trademarks of Telcordia Technologies, Inc.
28、 dba iconectiv. LRN Assignment Practices April 20, 2018 ATIS-0300065 2 3. Remote switches that have a unique, assigned NPA-NXX also may have a unique LRN assigned to the remote switches6. 4. The LRN must be selected and assigned from a valid NPA/NXX that has been uniquely assigned to the service pro
29、vider by the Central Office Code Administrator and published in the LERG Routing Guide. An LRN should be selected and assigned with the following considerations: Do not select and assign the LRN from an NPA/NXX that is planned to be re-homed to another switch. Do not select and assign the LRN from a
30、n NPA/NXX that has a majority of the NXX numbers assigned to a single customer. Do not assign the LRN from an NPA/NXX that is assigned to the local choke network. Do not assign the same telephone number as both an LRN for a switch and a working number for a customer.7 Do not assign any TLDN or ESRD/
31、ESRK wireless administrative number as an LRN. Do not select and assign the LRN from a block that otherwise may be eligible for donation to the thousands-block number pool.8 5. An LRN may have to be changed due to any of the following: switch replacements code moves or LERG reassignments NPA Splits
32、(as a result of an NPA-NXX split, a service provider may have to change their assigned LRN) Donation or return of the thousands-block containing the LRN 6. If a switch serves multiple NPA/NXXs, wherever possible, do not select and assign the LRN from an NPA that has been identified for area code rel
33、ief. 7. The LRN will be published in the LERG Routing Guide9. LERG Routing Guide LRN records are used by some SPs for trouble shooting and network engineering purposes. Within five business days of the assignment of an NXX that is to be used for LRN purposes, or when an LRN is assigned from an NXX a
34、lready in an SPs inventory, the SP should forward a CO Code Part 2 Form 7 to its AOCN for input into Business Integrated Routing and Rating Database System (BIRRDS). 8. Service providers must maintain internal records of LRNs as a separate sub-category of “Administrative” in their TN inventories (FC
35、C 00-104 36 and 62, see also 47 CFR 52.15 (f) (1) (i). 9. Shared service provider NPA-NXXs should not be used for LRN assignments. 10. For thousands-block number pooling, the LRN shall only be selected and used by the Code Holder from its assigned/retained thousand block(s). 6See footnote 3. 7It sho
36、uld be recognized that there are some numbers that have been assigned as both a LRN and a working customer number, which is technically feasible. There is no requirement that those assignments be discontinued, including instances when the customer has ported the number to another service provider. S
37、ee ATIS-1000002, Number Portability Switching Systems. 8An SP can avoid the donation of blocks containing administrative numbers e.g., LRNs, Temporary Local Directory Numbers (TLDNs), Mobile Station Roaming Numbers (MSRN), by consolidating these numbers within blocks it intends to retain. The portin
38、g of an LRN can cause call delivery failures. 9At a minimum LRNs that are associated with ported and/or pooled records in the NPAC should be published in the LERG Routing Guide. Failure to publish LRNs in the LERG Routing Guide leads to confusion and more investigation time during the resolution process to determine to whom the LRN belongs.
