[VoiceOps] Local calling areas & 7-digit dialing (NANP)

Thu Jan 12 18:01:18 EST 2012

Local calling areas are noted in each of the LEC tariffs by rate centers.
They are based on what other rate centers you can call from a particular
rate center. I live in the Franklin TN and while Nashville TN is in my EAS
area and Murfreesboro TN is also in the Nashville TN EAS area, Franklin is
not in the EAS area of Murfreesboro and visa versa, so you can't make the
assumption that just because Franklin and Murfreesboro can both call
Nashville that they are EAS to each other. 

To set up your switch with the correct EAS areas, you have to pull a list of
NXXs that are local or EAS to that rate center and program your switch to
know that if a call is made to any of these NXXs it is considered local. The
best free source to find this information is in localcallingguide.com

Mary Lou Carey

BackUP Telecom Consulting

CLEC Consultant

OFF: 615-791-9969 

From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org]
On Behalf Of PE
Sent: Thursday, January 12, 2012 4:23 PM
To: voiceops at voiceops.org
Subject: Re: [VoiceOps] Local calling areas & 7-digit dialing (NANP)

The NANP link that Paul posted is a good start because it at least tells you
where 7-digit is allowed, etc. Not sure if the local calling data that you
can get from CCMI (et al) gives you this info. You'd think, although my
experience with any of those is that they are fraught with errors. 

The proper thing (IMO) is that everywhere go 10 digits. It's only 3 more
digits, people!

On Thu, Jan 12, 2012 at 5:11 PM, Paul Timmins <paul at timmins.net> wrote:

http://www.nanpa.com/nas/public/npa_query_step1.do?method=resetNpaReportMode
l

Plus the ilec tariffs may tell you most of it.

Often the state PUC will know these strange little quirks, or can tell you
where they exist. I don't think they're catalogued in any one place.
-Paul

On 01/12/2012 04:35 PM, Nathan Anderson wrote:

So we have 7-digit dialing in place for NANP destinations.  The
implementation is really stupid-simple: if 7 digits are dialed, take the
originating number's area code and tack it on to the front of the dialed
number.  I am pretty sure this is how most commercial ITSPs do it (as tested
also on Vonage and Packet8).

But for certain areas, this doesn't properly mimic the 7-digit dialing that
people who still have a POTS circuit from their LEC are used to.  Take ours
for example: I'm in Moscow, ID (NPA 208).  We sit smack-dab on the WA/ID
state border.  8 miles to the west of us is Pullman, WA (NPA 509).  Both
cities have the same ILEC: Frontier (f/k/a Verizon f/k/a GTE).  There has
been an understanding here since (I think) the mid-80s that calls between
Moscow and Pullman are and will remain local.  But on top of that, if you
dial a Pullman NXX from Moscow or a Moscow NXX from Pullman as 7-digits, the
call is patched through even though the NPA is different and even though (in
some cases) both NPAs have NXXes that overlap with each other (although the
corresponding NXX in the same NPA as the caller would be considered a
long-distance call in all cases I can think of).  The ILEC phone switch
still does the "right" thing.  It's been this way for YEARS, and people here
are used to it.

Now say I wanted to implement something like that for our customers.  I know
what the special exceptions are for this local market, and could probably
make it work on our switch.  But I only know about them because I've lived
here and know the drill as a result.  And I don't know how common or not
this kind of thing is in other areas where you might be on the geographical
edge of one's NPA(s).

So the question I have is, is there some kind of central resource/authority
that I can go to in order to find out what the dialing rules are for a given
rate center (mandatory 10-digits/7-digits only within your own NPA/7-digits
for certain local NPA-NXX outside your own NPA)?  ...or is the only way to
know for sure to find out from the locals?

-- Nathan
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