Part I- Rules Applicable to Code or block holders that have filed at least three NRUF Reports

Code or block holders that have acquired and retained public numbering resources and have filed at least three Numbering Resource Utilization/Forecast (NRUF) Reports with the North American Numbering Plan Administrator (NANPA) must follow the following guidelines in determining the level of numbering resources that they are permitted to retain as a six-month inventory. A separate calculation shall be made for each rate center within each area code within which the carrier holds an inventory of numbering resources:

· Calculate the change in the historical demand for telephone numbers, which represents the code or block holder's actual growth. Code or block holders shall use the most recently filed NRUF Report (NRUF at time 2) and the NRUF Report filed 12 months before the most recently filed NRUF Report (NRUF at time 1). The change in the historical demand for telephone numbers comprises of those telephone numbers categorized as Assigned or Intermediate in the NRUF Reports. The formula for calculating the change in the historical demand for telephone numbers shall be ((Assigned numbers + Intermediate numbers as of NRUF at time 2) - (Assigned numbers + Intermediate numbers as of NRUF at time 1))/2.

· Determine the appropriate growth rate whereby the maximum growth rate is 15% to use to calculate the projected growth in telephone numbers for the next six months.

· Compute the projected growth in telephone numbers. The formula shall be the product of the change in the historical demand for telephone numbers and the appropriate growth rate.

· Find out the excess inventory of telephone numbers. The formula shall be the difference of the Available numbers reported in NRUF at time 2 and the projected growth in telephone numbers.

· Figure out the short-term inventory level. The formula shall be the difference of the total numbering resources and the excess inventory of telephone numbers.