I agree, also have had this religious argument with an international
telephony professional who disagrees
He doesn't see that the variable length numbering (lack of ) plan can
really become a problem
On a similar note, since the NANP has become all electronic, there
should never have been another area code split. It is costly to business
and confusing to distant users who, after the passage of time try to
locate someone in the now split off area code.
Area codes are slowly losing their meaning as well, with LNP and VOIP
services offering an NPA unrelated to geography
With number assignments now mostly left in the laps of bureaucrats, the
NANP will soon be in the same mess as the rest of the world.
John Novack
Doug Crompton wrote:
Wow what a mess! I can imagine how much easier it would be if the world
adopted a country/area/exchange scheme like in the US with known length.
It must be complicated in Germany just within the country. At least in the
US we know what the length should be so if we don't have that we know the
number is in error.
Doug
On Fri, 22 Dec 2006, Anselm Martin Hoffmeister wrote:
Am Freitag, den 22.12.2006, 00:53 -0500 schrieb Doug Crompton:
Question... What is the purpose of the + before the number? Does anyone
actually have to enter it? If so how would you do it? It is not used in
the US but do I see it come in on SIP lines CID. I assume the CID ignores
it in the number as I do not see it on the display. It is however stored
in asterisk and when doing CID comparisions it can be a problem.
The "+" is replaced by the telco you are connected to - by whatever the
local prefix for "international call" is. In the US and Canada it will
be 011, in most parts of the world "00", and there is Russia with its
exotic "08 wait for beep 10"... The "+" should work in GSM mobile
networks and most SIP providers seem to accept it.
For callerid, there seem to be several cases. One of my providers (the
others manage better and always give "00492281234567" formatted numbers)
gives CID as "+491601234567" for calls from one German mobile network,
"491637654321" from a second network and "02281234567" from landline, so
my dialplan has to cope with that such that my endpoints show the proper
number. This is done by the following logic:
If number begins with "+", strip it.
If number begins with anything but 0, prepend "00".
If number begins with "0049", replace by "0".
Although in Germany you can dial "0049" (region) (number), readability
is better when there is only the "0" (region) (number) on the display -
especially as numbers tend to get long, and e.g. Grandstream BT-100 only
have a 12-digit display.
BTW the longest number I _think_ is planned in Germany is 9 digits after
the area code for 2- and 3-digit area codes, 8 for 4-, and 7 for 5-digit
areacodes. There is one exception though that I know of: One of our
ministeries has usually 55-4444 numbers (55 being their number, then
four digits DDI), but their fax numbers are 8-digit. Thus resulting in
total in 011-49-228-55-87654321 from US, 18 digits.
If you can, leave room for long numbers.
BR
Anselm
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* 215-431-6307 *
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