Le 12/09/2014 12:18, scott a écrit :
>> Well since my number set is bigger I don't see a problem everyone
>> keeping their numbers, anyway looks efficient enough.
> 
> How can you have people keeping their existing numbers whilst adding
> more digits? If you have some people with 6 digit numbers and others
> with 8 digit, how does the system know whether to connect or not after
> the 6th digit?

The same way we have here "short" number: dedicates a heading digit for
them.

As long as all the 6 digits numbers do not cover the whole tree, and in
particular, a first digit is still unused, you can make such scheme:

 all numbers starting with 1 to 5 have 6 digits.
 all numbers starting with 6 have 8 digits.
 all numbers starting with 7 have at least 9 digits.
 numbers starting with 73 have 10 digits.
 numbers starting with 74 have 11 digits, unless its 745 which have 12
digits.

Here (France), it's 10/9 digits. (sort of)
Locally, it's 10 digits: first is for choice of carrier by caller, then
it's the international number of 9 digits.

But, number starting with 1 (as the carrier) are in fact urgency/utility
number (police, fireman, and so on), and are 2 or 3 digits at most.
(including the European 112, but fireman is on 18, medical on 15 and
police on 17))
well, 118xyz is the privatized look-up system (previously 12)), so you
can pay more for a previously free service.

Number starting with 3 are short numbers for TV/radio/and other
commercial. (4 or 5 digits)

Number starting with 0, 4, 7, 8, 9 are carrier's choice by caller.
(well 0 is just: use default operator, not a dedicated operator)
So far, 2,5,6 are back in the pool.

Assuming you are not starting with 1, 2, 3, 5 or 6, the second number
lead to:
1 to 5: geographical mapping
6 & 7 : mobile phone
8 : variously taxed number (0800 is free, 08x.. might cost you 200€ per
call or more, even for 1 minute)
9 : land line, not geographically mapped (most ADSL/voip phone-box).
0 : international call (followed by country code and international number)

Well... last catcha, 16XY is an extension made allow to choose between
more carriers (XY being the identifier of the carrier).

So, if you are playful, you can actually dial 13 digits to reach your
neighbour. (4 of 16XY, and 9 of the actual line that an Australian would
have dialed too).

See, from 2 digits down to 13, without crossing a border.

-- 
Just because nobody complains does not mean all parachutes are perfect.

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