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From: ehopper@ehpcb.wlk.com (Ed Hopper)
Newsgroups: comp.dcom.telecom
Subject: Re: Last Four Digits of Phone is '0000'
Message-ID: <15610@accuvax.nwu.edu>
Date: 20 Dec 90 13:24:54 GMT
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X-Telecom-Digest: Volume 10, Issue 898, Message 9 of 11


mailrus!uflorida!rm1!bapat@uunet.uu.net (Subodh Bapat) writes:

> My question is: how do the LECs decide what range of numbers in each
> prefix to reserve for whom? Are there different blocks of numbers in
> each prefix pre-reserved for, say, residential, business trunks, DID,
> and Centrex (even if such services aren't actually connected)? 305-384
> is a new prefix in the rapidly expanding West Broward county area, and
> it's not even clear that the demographics have developed enough to the
> point of presenting a well-defined customer mix profile.

> Can anyone with any LEC background or knowledge shed any light on such
> number allocation policies?

Well, my LEC background is getting ancient (1982), but here goes.

Assume that Megacorp's DID PBX uses NNX-1000 to NNX-2500.  You want
NNX-2754.  The next 500 numbers could easily be "reserved" for
Megacorp.  I know I made exactly those sorts of "reservations" for my
customers several times.  Mountain Bell (now AKA US West) did not
charge for these, of course, that was a simpler time.


Ed Hopper

BBS: 713-997-7575  ehopper@attmail.com  ehopper@ehpcb.wlk.com