[VoIP] Number portability in CNET

[Steph Kerman]

It does.  Thanks.
Steph

Mark Rudholm wrote:
> It doesn't have to.
>
> DNS handles this automatically.  If you look up something more specific than
> DNS knows about, it just returns the relevant most specific information 
> it has.
>
> So, if you look up 8.6.3.2.5.5.5, and DNS only goes as specific as 5.5.5,
> you'll get the records relevant for 5.5.5.
>
> For example, try doing "dig ns foo.bar.flim.flam.cnn.com" and see what
> NS record you get.  (it should be for "cnn.com" since that's the most 
> specific
> matching record).
>
> So, to carve out a single 7-digit number from a given office code, the only
> entry that has to be made is for that single 7-digit number, it is not 
> necessary
> to populate the database with all of the non-ported numbers.
>
> Basically, if your DNS query is over-specific, you just get the record 
> that is
> most specific that still matches.
>
> I hope that made sense.
>
> -Mark
>
> Steph Kerman wrote:
>   
>> How does ENUM get updated when new line assignments are made?
>>
>> Steph
>>
>> Shane Young wrote:
>>   
>>     
>>> All 7 digits are sent in the query.
>>>
>>>
>>> Quoting Steph Kerman <stfkerman at jps.net>:
>>>
>>>   
>>>     
>>>       
>>>> How does this fit in with David's comment?
>>>>
>>>> If the full 7-digit number is looked up in ENUM for each call to allow
>>>> sharing of office codes doesn't that require ENUM to be updated for all
>>>> new line assignments at local switches?  I thought only the 3-digit
>>>> office code was being looked up and that there was discussion about
>>>> extending this to the thousands digit to allow sharing of office codes
>>>> in blocks of 1000 numbers, but that it had not been done.
>>>>
>>>> Steph
>>>>
>>>> Shane Young wrote:
>>>>     
>>>>       
>>>>         
>>>>> There is no need to do either.
>>>>>
>>>>> Since we always lookup every number in DNS via ENUM, greg just points
>>>>> the "ported" number to the new destination.
>>>>>
>>>>> It's a lot like the way real LNP works.
>>>>> --Shane
>>>>>
>>>>>
>>>>> Quoting Steph Kerman <stfkerman at jps.net>:
>>>>>
>>>>>
>>>>>       
>>>>>         
>>>>>           
>>>>>> Send by redirecting at the originating point or send by tandeming
>>>>>> through your system?
>>>>>>
>>>>>> Steph
>>>>>>
>>>>>> David Josephson wrote:
>>>>>>
>>>>>>         
>>>>>>           
>>>>>>             
>>>>>>> I think that anyone who has an office code should be able to provide
>>>>>>> routing to other CNET numbers, should anyone else have a desire for a
>>>>>>> code in that prefix. I am in the process of constructing a 411 service
>>>>>>> to live at 555-1212, and I do have 555-2368 ringing on my desk. But if
>>>>>>> someone wanted another 555 number I'd be happy to write a line in the
>>>>>>> dialplan to send calls somewhere else.
>>>>>>>
>>>>>>> --
>>>>>>> David Josephson
>>>>>>>             
>>>>>>>               
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