[cisco-voip] Determining if a DID block is available?

[William Paris]

You are correct Jason, number portability come into effect. But for recently assigned blocks, say, less than 1 year old.. . there is a good chance the original-assigned carriers still own those blocks.

I previously mentioned using the NANPA website to find those recently assigned blocks. However, NANPA's 'resolution', as pointed out by Bob (not sure if that post made it to the list), is only good in blocks of 10,000.

There is another site called the Local Calling Guide located here:

http://www.localcallingguide.com

Their database resolution is 1,000 block, not 10,000 and may prove more useful locating 'fresh' blocks recently assigned to your carrier. Good luck...    Bill



From: Jason Aarons (AM) [mailto:jason.aarons at dimensiondata.com]
Sent: Wednesday, August 31, 2011 5:12 PM
To: Norton, Mike; Robert Kulagowski; William Paris
Cc: Cisco VOIP
Subject: RE: [cisco-voip] Determining if a DID block is available?

Number portability means anyone could have that number. Someone could have ported it to another carrier.  It rules out saying that NPA-XXX belongs to a carrier.

Jason Aarons
Consultant
Dimension Data
904-338-3245 mobile

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Norton, Mike
Sent: Wednesday, August 31, 2011 3:43 PM
To: Robert Kulagowski; William Paris
Cc: Cisco VOIP
Subject: Re: [cisco-voip] Determining if a DID block is available?



They are allocated - to the phone company that owns the NXX. The only way you can find out if that phone company is willing to rent them to you is to ask them.

What you are asking for is like a centralized directory of which apartments are occupied. There is no such thing. You have to decide which building (NXX) you're interested in and then see who the property manager (LEC) is. Then find out from the property manager either by asking them or seeing if they publish their own list somewhere. It's unlikely they would have a public list because it would not only be used by prospective tenants but also by door-to-door salespeople and competitive landlords.

A block of 50 DIDs is pretty tiny. For such a small amount, I would probably begin my search by just calling a few random numbers from the 50 and see where the call ends up.

--
Mike Norton
I.T. Support
Peace Wapiti School Division No. 76
Helpdesk: 780-831-3080
Direct: 780-831-3076



-----Original Message-----
From: cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net> [mailto:cisco-voip-bounces at puck.nether.net]<mailto:[mailto:cisco-voip-bounces at puck.nether.net]> On Behalf Of Robert Kulagowski
Sent: August-31-11 12:25 PM
To: William Paris
Cc: Cisco VOIP
Subject: Re: [cisco-voip] Determining if a DID block is available?

On Wed, Aug 31, 2011 at 1:10 PM, William Paris <wparis at independenthealth.com<mailto:wparis at independenthealth.com>> wrote:
> Bob, you could go to the NANPA website (http://www.nanpa.com), download the utilized/available NPA-NXX file for your area, and determine of your dialtone vendor and/or vendors competitor has been allocated any new blocks of number recently. Other than that you're at the mercy of your vendor.. .

Right, but that report doesn't have granularity below the NXX level, so I can't find out if the 50 DIDs after my block of 00 to 49 are allocated to anyone else. :(

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