[VoiceOps] LNP, tandems, etc.

Wed Aug 29 12:56:59 EDT 2018

If you have an LRN in the ILEC tandem provider's area, you can port 
to/from any rate center in that ILEC area. If there are small ILECs that 
use the big ILEC's tandem, you can also port to/from those rate centers. 
However, if you have more than 24 DS0s worth of traffic to that small 
ILEC area, the small ILEC can force you to install a direct connection 
to them. That doesn't happen very often but I've seen it happen a few 
times.

If you're using a third party provider like Inteliquent, you need to 
have an LRN in every LATA that you want to port numbers in/out of. Your 
traffic can traverse their network between LATAs through your one 
connection with them, but in the background Inteliquent has to have 
connections with each tandem provider in both areas in order for it to 
work. That's why they give you a list of all the rate centers that they 
cover when you sign up with them!

Mary Lou Carey

BackUP Telecom Consulting

Office: 615-771-7868 (temporary)

Cell: 615-796-1111

On 2018-08-28 06:00 PM, Mike Hammett wrote:
> Meaning if I thought were true? I had just assumed that Inteliquent
> did have the connections to every tandem in the LATAs they serve,
> given that (my thought) that you could only port numbers on the same
> tandem, so universal coverage would require connections to every
> tandem. We're actually looking at someone like Inteliquent to expand
> our footprint.
> 
> So I'm supposed to be connected to every tandem in my LATA? In my
> LATA, there are only two (I believe), but some LATAs (like Chicago)
> have several. I'm supposed to drag a DS1 (or use Inteliquent, etc. if
> available) to connect to each one, even if I don't provide service in
> the rate centers traditionally served by that tandem? It seems like
> Comcast threw a dart at a dart board in choosing which tandem to
> connect to vs. going with the one that everyone else in that town
> uses.
> 
> So then I could port a number from any rate center in my LATA (say
> Savanna) and point it to my LRN, living off of a tandem switch that
> the Savanna ILEC isn't connected to (from my outside world
> perspective)? Is there even the LATA constraint? Given the porting
> limitations I had experienced in the VoIP world, I assumed it was a
> tandem-by-tandem basis.
> 
> So the LERG shows which tandem I need to send traffic to if I want to
> talk to them, but they could send their outbound calls to a different
> tandem? My current customer complaint is for calls that we're sending
> to Comcast, apparently homed off of the other tandem.
> 
> If everyone is supposed to be on every tandem, then why can't the
> tandem I'm on just accept the calls I'm sending to Comcast, since
> Comcast should be there? Obviously me not being on the other tandem
> would affect inbound traffic to me.
> 
> Is there another service I should be paying Frontier for to get me to
> the other tandem with some value-add service? I know CenturyLink hops
> through almost every town going that way (former LightCore and others
> before route). Frontier or CenturyLink may be able to get me a DS1 to
> the other tandem if I need that.
> 
> I'm aware that I could still be completely missing the mark.
> 
> BTW: Thanks for TelcoData. I subscribed a long time ago, but haven't
> for many ages.
> 
> -----
> Mike Hammett
> Intelligent Computing Solutions
> http://www.ics-il.com
> 
> Midwest Internet Exchange
> http://www.midwest-ix.com
> 
> -------------------------
> 
> FROM: "Paul Timmins" <ptimmins at clearrate.com>
> TO: "Mike Hammett" <voiceops at ics-il.net>
> CC: voiceops at voiceops.org
> SENT: Tuesday, August 28, 2018 5:19:11 PM
> SUBJECT: Re: [VoiceOps] LNP, tandems, etc.
> 
> If that were true, you wouldn't be able to use inteliquent (et al) as
> your access tandem. Everyone is supposed to be directly or indirectly
> connected to every tandem in the LATA (which you can't independently
> verify, as telcodata and the LERG both show terminating tandem
> information to reach that end office, not what tandems the end office
> is hooked to to terminate calls.
> 
> On Aug 28, 2018 17:47, Mike Hammett <voiceops at ics-il.net> wrote:
> 
>  I thought you had to be on the same tandem to port a number, but with
> what our tandem operator (Frontier) is telling me, this isn't the
> case.
> 
> Comcast ported a number from us in town A. The LRN they pointed to is
> based in town B (per TelcoData). The tandem generally used by carriers
> in both towns is based in town B. Naturally, we send traffic to that
> tandem.
> 
> The operator of that tandem is telling us that the LRN is actually
> homed off of a different tandem in our LATA (operated by CenturyLink)
> in town C. Unfortunately, I can't corroborate this information with
> TelcoData the only rate center I see off of that tandem in TelcoData
> is an AT&T town next door.
> 
> Where can I read up authoritatively on the porting requirements that
> would apply to this and related bits of info I should know?
> 
> I'm checking on our LERG access as I know that has the authoritative
> information, but I don't have that access at the moment. Maybe we're
> not subscribed to it.
> 
> Number NPA-NXX in town A:
> https://www.telcodata.us/search-area-code-exchange-detail?npa=815&exchange=991
> 
> LRN NPA-NXX in town B:
> https://www.telcodata.us/search-area-code-exchange-detail?npa=815&exchange=901
> 
> Tandem in town B:
> https://www.telcodata.us/search-switches-by-tandem-clli?cllicode=DKLBILXA50T
> Tandem in town C:
> https://www.telcodata.us/search-switches-by-tandem-clli?cllicode=DIXNILXA50T
> 
> Thanks.
> 
> -----
> Mike Hammett
> Intelligent Computing Solutions
> http://www.ics-il.com
> 
> Midwest Internet Exchange
> http://www.midwest-ix.com
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