>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
