[188740] in North American Network Operators' Group
Re: phone fun,
daemon@ATHENA.MIT.EDU (John Levine)
Wed Apr 13 17:54:26 2016
X-Original-To: nanog@nanog.org
Date: 13 Apr 2016 21:52:23 -0000
From: "John Levine" <johnl@iecc.com>
To: nanog@nanog.org
In-Reply-To: <570EAD5F.8010502@vaxination.ca>
Errors-To: nanog-bounces@nanog.org
>Is there the equivalent of BGP for number portability where every telco
>has the full table of who owns each prefix as well as individual routes
>for ported numbers ?
Not really. There's a switch database used for routing calls, but
that's different from LNP which is a layer sort of above that.
>Or is there a central database that is consulted before a dialed number
>starts to be connected so originating telco knows to send call ?
Often, if the switch can't tell that the number hasn't been ported.
>Or does the originating telco route the call to the original onwer of
>the prefix and lets that original owner figure out how to terminate the
>call ?
That's called Onward Routing. They do it some places but not in North
America. See RFC 3482 for a well written overview of number portability.
>From a long distance billing point of view, if Bell Canada connects to a
>number originally onwed by AT&T but ported to Verizon, with whom would
>Bell share long distance revenues ?
They pay whatever long distance company they use, and that company
pays the owner of the switch to which it's delivered. The long
distance company also pays a very small amount to Telcordia which runs
the LNP database to tell whether the number's been ported and if so to
which switch.
R's,
John
