12. Administration, Billing and Rates

According to the Long Term Numbering Plan an additional digit is added to all telephone addresses. The additional access lines made available consequently depends on a simple mathematical algorithm. At present, after deducting the number of addresses reserved for special purposes, some 6.4 billion possible telephone addresses are available for general use in the NANP service area. This number will increase by roughly ten-fold by adding an additional digit to the COX group or to the line number. By rough extrapolation into the foreseeable future, the Timeline for any of the options of the Long Term Numbering Plan can be calculated: the period required for the additional addresses created by the LTNP to be exhausted.



Calculating the Timeline for MTAS is not quite so simple. According to the MTAS protocol only telephones have primary addresses, with all other devices assigned sub-addresses. Hence, the number of addresses required will only increase at the rate telephones are connected to the PSTN, not ancillary devices. If present trends continue however, with the number of ancillary telecommunication devices increasing significantly faster than the increase in the number of telephones, there will not be a need for additional addresses beyond those presently available in the NANP service area. Rather the number of addresses released for reuse will exceed the number of new addresses required, at least for the foreseeable future.