David_H wrote on Dec 6
th, 2008 at 4:29pm:
… Do they have a special function only national dialling can perform?
Definition from the
National Telephone Numbering Plan:
Quote:‘National-Dialling-Only Number’ means a Geographic Number that can only be Adopted or otherwise used with its Geographic Area Code and for purposes where End-Users will not dial it
It goes on to say:
Quote:Part B: Restrictions for the Adoption of Telephone Numbers
[…]
B3: Specific Restrictions on Telephone Numbers
B3.1 Geographic Numbers
[…]
Local Dialling
B3.1.3 Geographic Numbers shall not be Adopted or otherwise used other than where End-Users from Geographic Numbers in the same geographic area as the Called Party are able to use only the Subscriber Number (except where those numbers are National-Dialling-Only Numbers – see B3.1.5 below).
[…]
‘National-Dialling-Only’ Numbers
B3.1.5 Geographic Numbers shown as ‘Free for National-Dialling-Only’ in the National Numbering Scheme shall not be Adopted or otherwise used in circumstances where they have public visibility. Where these numbers are Adopted or used for outgoing services a presentation number that is either non-geographic or which permits Local Dialling shall appear for Calling-Line Identification purposes. In the event of a code change to eight-digit numbering in a geographic area, those who have Adopted or used ‘National-Dialling-Only’ numbers shall migrate to the appropriate new range by the end of Parallel Running.
The topic of National Dialling Only Numbers has been
discussed on our forum before.
David_H wrote on Dec 6
th, 2008 at 4:55pm:
Not to worry, it is more a general reason for their existence needed than more technical details. I also found a psychic reader using the number 020 0200 8901. Now why would they request a weird one like that especially as nearly all callers from London would try the short version and get the unobtainable noise? And why would the telco provide it if these are normally reserved for automated calls
(I understood that bit)?
I think that this will confuse people as they may neglect to dial the code. This is crucial where the national dialling only number (after the prefix) starts 118, for example. Dialling without the code means an expensive call to a directory enquiries service.
I am not convinced that they would have necessarily requested one of these numbers. Telephone companies are allocated prefixes, usually for 10k blocks of numbers. Numbers starting 020 0200 are allocated to
TelXL Limited change date January 2004. The only other London TelXL prefix is 020 3368, change date February 2008.
Having chosen TelXL (or one of its resellers), these organisations are then given a number. Before February this year, the only London prefix allocated to TelXL was 020 0200.