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· Companies are required to return to the NANPA any prefix held for more than six months without being used.

· "Imminent exhaust criteria" are established in all area codes with lotteries or number pools. In each rate center in which companies request additional numbers, they must provide to the NANPA a form demonstrating they will be out of numbers within six months.12

· Companies must satisfy a minimum 75% fill rate requirement before being eligible to request a growth prefix in any area code in rationing and before being eligible to receive a thousand-block through a number pool. Companies must assign numbers in thousand-block sequence, assigning numbers in the next block only once a 75% fill rate has been attained in the prior block.

· Reserved numbers - Numbers that are reserved in blocks for future use by specific customers;

· Administrative numbers - Numbers that companies use for their own internal purposes;

· Intermediate numbers - Numbers that are made available for use by another telecommunications carrier or non-carrier entity for the purpose of providing telecommunications service to an end user or customer; and

· Aging - Numbers from recently disconnected service, which are not reassigned during a fixed interval.


For convenience, "other administrative numbers" are reported as a group for purposes of the Utilization Study

1 NANPA is a role performed by NeuStar, Inc. The FCC chose NeuStar, formerly Lockheed Martin, to perform the functions of numbering administration and area code changes nationwide. 2 At present, only wireline carriers are required to participate in number pooling. The FCC has granted most wireless carriers an extension of time, until November 2002, to implement the technology that will support number pooling. The FCC has permanently exempted paging companies from implementing the technology necessary to pool. 3 The percentage of numbers in use in a particular block of 1,000 numbers is referred to as the "contamination" level. 4 Today called the Incumbent Local Exchange Carrier (ILEC) 5 Today called Competitive Local Exchange Carriers (CLEC) 6 In addition, the California state legislature enacted Section 7937 of the California Public Utilities Code. Effective on January 1, 2000, Section 7937 requires the CPUC to prepare and submit to the Legislature, by July 1, 2001, a study of the telecommunications industry's usage rates of telephone numbers in all California area codes. This report also complies with that legislative requirement with respect to the 626 area code. 7 A company's request for its first prefix in the rate center is considered an initial request; requests for additional prefixes are considered growth requests. 8 See Chapter Three of this report for a discussion of LNP. 9 FCC's Opinion and Order on Telephone Number Portability FCC 97-74, issued March 6, 1997 10 Cellular companies, PCS companies, and paging companies comprise the wireless category. 11 ILECs and CLECs

12 The CPUC revised the imminent exhaust criterion from three months to six months in Joint Assigned Commissioner and Administrative Law Judge's Ruling Implementing Revised Procedures to Conform to FCC Order, dated April 30, 2001.

13 Report and Order and Further Notice of Proposed Rulemaking, CC Docket No. 99-200 FCC 00-104 (released March 31, 2000). 14 Wireline carriers include ILECs and CLECs. 15 A further breakdown of the 2.8 million available numbers held by carriers is shown in Appendix B, Table B-1. 16 Type 1 carriers are not considered wireline or wireless companies. Type 1 numbers are programmed in the wireline company's end office, but are used by a wireless company. For further description of Type 1 carriers, see Section D.4.a. 17 3.7 million numbers are comprised of 1.0 million estimated pooling donations by companies plus 2.7 million available through the lottery. 18 The recommendations include receiving authority from the FCC to increase contamination threshold (25%) for pooling, recovering blocks from special-use prefixes, recovering unused numbers from non-LNP-capable carriers and Type 1 carriers, and requiring wireless carriers to participate in pooling, as described later in this report. 19 See Appendix B, Table B-2 for a detailed breakout of the 4.4 million numbers. 20 Although all wireline carriers are required to be LNP capable, three wireline carriers in the 626 area code remain non-LNP capable. 21 10% or less contaminated means that out of 1,000 numbers in a block, 100 numbers or fewer have been classified as unavailable. 22 Future need may include serving new customers or offering new services. 23 See Chapter 3 for the status of pooling in the 626 area code. 24 See Footnote on Table B-2 in Appendix B for the derivation of this estimate. 25 See Table B-1 in Appendix B. These 431,000 are comprised of 49,252 numbers from blocks that are 10-15% contaminated, 67,882 from 15-20% contaminated, 33,687 from 20-25% contaminated, and 279,876 numbers from blocks that are more than 25% contaminated. Later in this chapter, TD recommends additional steps that can be implemented to make more of these 431,000 numbers available for number pooling. 26 INC's Thousand Block (NXX-X) Pooling Administration Guidelines, dated January 10, 2000, state that carriers should donate specified thousand-blocks. 27 DA is the abbreviation for District Area. These rate centers may include parts of several cities or unincorporated areas within the greater Los Angeles area. 28 Additional numbers from the last three columns of Table 2-5: 49,252 + 67,882 + 33,687 = 150,821. 29 See footnote 3 of Table B-2, Appendix B, for the derivation of this estimate. 30 All blocks identified in this section refer to blocks in which contamination levels were above 10% but less than 15%. 31 See Chapter 1 for the discussion of Decision 00-07-052. 32 This includes the five prefixes held by the three companies who did not report utilization data. 33 FCC 00-104, Paragraphs 237, 238, and 241 34 The annual growth rates were calculated by calculating the percentage increases in assigned numbers between 6/30 and 12/31/2000, and multiplying the results by 2. 35 Remote Call Forwarding allows a customer to have a local telephone number in a distant location. RFC is similar to call forwarding on a residential line, except that the RCF customer has no phone, no office and no physical presence in that location. Direct Inward Dialing uses a trunk from the central office which passes the last two to four digits of the Listed Directory Number into the PBX, thus allowing the PBX to switch the call to the correct extension without the use of an attendant. Existing DID retail service is limited to PBX services. For purposes of providing INP, DID switch functionality is used to provide INP to any CLC customer regardless of the type of terminal equipment used on the customer's premises. 36 However, three wireline carriers in 626 still remain non-LNP capable. 37 The emergency preparedness prefixes are for services other than 911. 38 The number used for inter-area code directory assistance, which is uniform throughout California, is 1-XXX- 555-1212. This number has been designated for this use at the federal level. 39 An example would be a customer request for 2,500 numbers to be used in 2000, coupled with a request to have the next 2,500 numbers in sequence "reserved" for the customer to use in 2001. 40 Central Office Code (NXX) Assignment Guidelines, prepared by the Industry Numbering Committee, January 27, 1999 version, Section 4.4. 41 FCC Order 00-280, CC Docket No. 99-200, adopted and released on July 31, 2000. 42 See FCC Order 00-129, Paragraph 114 43 See Appendix D for a breakdown of reserved numbers reported in the 626 NPA by rate center. 44 See Appendix F for a breakdown of intermediate numbers held by wireline and wireless carriers. 45 Type 1 numbers are programmed in the wireline carrier's end office, but are used by a wireless carrier. 46 90,100 out of a total of 277,400 Type 1 numbers are unaccounted for or mismatched. 47 Type 1 numbers given to wireless carriers are from prefixes in which LNP has already been initiated by the wireline carriers. Because Type 1 numbers reside in the wireline carrier's end office, Type 1 numbers are LNP-capable and thus suited for pooling. 48 These blocks are 10% or less contaminated. 49 In the first NRO Order, both 360 days and 365 days were used as the time period for aging business numbers. In a clarifying order, the FCC adopted 365 days as the aging period for business numbers. When the CPUC sent out the parameters for utilization data for this study, the 360 day time period for aging business numbers was used. In order to be consistent with the time frames the FCC adopted, the CPUC is now using the 365 time period for aging business numbers. 50 As of July 1, 2001. 51 One prefix was opened in the 310 area code to supply numbers to the pool, and two prefixes were opened in the 909 area code to supply numbers to the pool. Several prefixes have been opened for LRN purposes. 52 Before a whole prefix is activated, the prefix must be first listed for 66 days in the Local Exchange Routing Guide (LERG), stating the rate center where the prefix will be located. 53 Data can be found in Pooling Appendix. 54 Sections 6.1.4 & 6.1.5 in INC 99-0127-023, January 10, 2000 55 FCC 96-286 in CC Docket No. 95-116. 56 FCC 99-19, WT Docket 98-229; CC Docket No. 95-116, Released: February 9, 1999. Paging companies are indefinitely exempt from becoming LNP-capable. 57 Further Comments of the California Public Utilities Commission and the People of the State of California in CC Docket No. 99-200, submitted May 19, 2000 58 See INC Contribution #336R of September 29, 2000, "UNP Architecture With Minimal Administrative Structure" and Focal and MCIWorldcom's Report on UNP Trial 59 NRO Order, FCC 00-104, CC Docket 99-200, ¶ 230. "We reiterate our finding that UNP and ITN [individual telephone number pooling] are not yet sufficiently developed for adoption as nationwide numbering resource optimization measures and conclude that ITN and UNP should not be mandated at this time." 60 See ¶ 231: "We permit carriers, however, to engage voluntarily in UNP where it is mutually agreeable and where no public safety or network reliability concerns have been identified." 61 For example, while the ILECs still control roughly 95% of the residential toll market, competitors have succeeded in making significant inroads into the business toll market, where the ILECs now hold only 50% of the market. If the CPUC were to decide that the ILECs should be "made whole" for any lost toll revenues, then other companies legitimately could demand a mechanism to make them whole as well. Alternatively, if the competitors cannot practically be reimbursed for lost revenues, then as a policy matter, the CPUC must decide if it is reasonable to allow only the ILECs to recover such revenue.

62 "Where Have All the Numbers Gone?" (Second Edition), The Ad Hoc Telecommunications Users Committee, prepared by Economics and Technology, Inc., June 2000. The estimate of $5.56 may be conservative.

63 The last major rate design proceeding undertaken for Pacific Bell and Verizon, then GTEC, was the Implementation and Rate Design (IRD) phase of the New Regulatory Framework proceeding, 1.87-l l-033. The IRD phase took three years to complete. 64 Prior to the opening of a number pool, all companies requesting telephone numbers got prefixes from the NANPA. With pooling, only non-LNP capable carriers receive prefixes from the NANPA, while LNP capable carriers receive thousand-number blocks from the pooling administrator. 65 See Chapter 1 for the discussion of Decision 00-07-052.

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