RE: [fwd: my comments to the SPAN list]

["Stastny Richard" <]

> -----Original Message-----
> From: Jim Reid [
	    
	    
] 
> Sent: Thursday, October 24, 2002 10:35 AM
> To: axelm@localhost
> Subject: Re: [fwd: my comments to the SPAN list] 
> 
> 
> >>>>> "axelm" == axelm  axelm@localhost writes:
> 
>     axelm> Yes, DNAME support was added in BIND9. But: DNAME is only
>     axelm> neccessary if you have such weird things like the "shortcut
>     axelm> dial prefixes" of Austrian cities (Vienna can be reached
>     axelm> via the prefix "01", but also via "0222").
> 
> There may also be a need for DNAME whenever area codes (or 
> equivalent) get renumbered. [This has happened to London's 
> area code twice in the last 20-25 years.] An ENUM trial 
> should explore the use of DNAME for these situations.
>
 
This was the major reason for the discussion: area code splits. If
anybody is interested,
in the hazzles involved with this, see the sections on area code splits
in the US ENUM
Forum Unified Document 6000. There also the permissive dialing period is
defined:

Permissive dialing period is the duration of time when the telephone
number under either the old area code or the new area code can be dialed
to reach the same termination.  The length of permissive dialing period
is normally a few months and is set by the state Public Utility
Commission for each involved area code.

And one solution, beside duplication of all relevant zones for the
permissive dialing
period is DNAME.

As Jim said, this is happing all over the world periodically. BTW, only
twicein London?

The speciality in Austria with +43 1 and +43 222 is, that we have an
permissive
dialling period with no (yet) defined end.

Regards
Richard